UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

                   CERTIFIED SHAREHOLDER REPORT OF REGISTERED
                         MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number: 811-07344

Morgan Stanley California Insured Municipal Income Trust
               (Exact name of registrant as specified in charter)

1221 Avenue of the Americas, New York, New York 10020
         (Address of principal executive offices)                     (Zip code)

Ronald E. Robison
1221 Avenue of the Americas, New York, New York 10020
                     (Name and address of agent for service)

Registrant's telephone number, including area code: 212-762-4000

Date of fiscal year end: October 31, 2007

Date of reporting period: April 30, 2007


Item 1 - Report to Shareholders

Welcome, Shareholder:

In this report, you’ll learn about how your investment in Morgan Stanley California Insured Municipal Income Trust performed during the semiannual period. We will provide an overview of the market conditions, and discuss some of the factors that affected performance during the reporting period. In addition, this report includes the Trust’s financial statements and a list of Trust investments.

Market forecasts provided in this report may not necessarily come to pass. There is no assurance that the Trust will achieve its investment objective. The Trust is subject to market risk, which is the possibility that market values of securities owned by the Trust will decline and, therefore, the value of the Trust’s shares may be less than what you paid for them. Accordingly, you can lose money investing in this Trust.

Income earned by certain securities in the portfolio may be subject to the federal alternative minimum tax (AMT).

	Fund Report
	For the six months ended April 30, 2007

Market Conditions

The economy continued to send mixed signals about its overall strength during the six-month reporting period. Rising energy prices and ongoing geopolitical uncertainty had a negative impact on investor sentiment, as did the contraction in the residential real estate sector. Turmoil in the sub-prime mortgage market intensified concerns about housing, and dominated investment headlines during the period. In fact, these concerns were the primary contributor to the sharp decline in the equity market in late February, which led to a ‘‘flight to quality’’ that forced yields on U.S. Treasury bonds lower and prices higher. The changing economic and financial picture led to changes in the Federal Open Market Committee’s (the ‘‘Fed’’) monetary policy bias as well. Although the Fed held the target federal funds rate steady, statements released following its March meeting signaled a more neutral bias. This apparent shift in policy led to a stronger equity market and began to move bond yields higher.

Long-term municipal bond yields (as represented by the 30-year AAA rated municipal bond), which stood at 4.06 percent at the end of October, ended the period slightly higher at 4.10 percent. The slope of the municipal yield curve remained relatively flat, with only a 50 basis point yield differential, or ‘‘pick-up,’’ between 30-year maturities and one-year maturities. In comparison, the yield pick-up from one to 30 years in April 2006 was 95 basis points, and has averaged 165 basis points over the past three years.

Declining interest rates in the fourth quarter of 2006 spurred a rebound in municipal bond issuance that led new issue volume for the calendar year to reach $383 billion, the second highest on record and only 6 percent below 2005’s record pace. In the first four months of 2007, new issue municipal volume increased by 37 percent versus the same period one year earlier, reaching a total of $135 billion. Insured municipal bonds continued to represent roughly half of all new issue supply. Municipalities continued to take advantage of lower interest rates to refinance their debt and refundings increased dramatically. California was the country’s largest issuer of municipal bonds during the period, and new issue supply for the state rose by 84 percent.

Strong demand by institutional investors and non-traditional buyers, including hedge funds and arbitrage accounts, helped long-term municipal bonds perform relatively in line with Treasuries for the period. The 30-year municipal-to-Treasury yield ratio, which measures the relative attractiveness of these two sectors, declined slightly from 86 percent at the beginning of the period to 85 percent by period end. A declining ratio indicates that municipals outperformed Treasuries while at the same time becoming more expensive (and thus less attractive) on a relative basis.

The State of California continued to enjoy a generally good economic footing. Although the slowdown in the real estate sector dampened the state’s economy, it did not stall growth as expansion in the service sector helped to offset continued weakness in real estate related employment. In terms of its budget, the state projects that fiscal 2007 will end slightly better than

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estimates due to good revenue growth. California’s inability to fully eliminate its structural deficit despite prosperous economic conditions, however, remains a credit concern.

Performance Analysis

For the six-month period ended April 30, 2007, the net asset value (NAV) of Morgan Stanley California Insured Municipal Income Trust (IIC) decreased from $15.38 to $15.25 per share. Based on this change plus reinvestment of tax-free dividends totaling $0.345 per share and a long-term capital gain distribution of $0.031341 per share, the Trust’s total NAV return was 1.73 percent. IIC’s value on the New York Stock Exchange (NYSE) moved from $14.46 to $14.83 per share during the same period. Based on this change plus reinvestment of dividends and distributions, the Trust’s total market return was 5.22 percent. IIC’s NYSE market price was at a 2.75 percent discount to its NAV. Past performance is no guarantee of future results.

Monthly dividends for the second quarter of 2007, declared in March, were unchanged at $0.0575 per share. The dividend reflects the current level of the Trust’s net investment income. IIC’s level of undistributed net investment income was $0.063 per share on April 30, 2007, versus $0.070 per share six months earlier.¹

During the reporting period, the Trust’s interest-rate positioning continued to reflect our anticipation of higher rates. This strategy helped the Trust’s total returns at the beginning of the period when interest rates rose, but tempered returns later in the period when rates declined. At the end of April, the Trust’s option-adjusted duration* including leverage was positioned at 11.2 years.

The primary detractor from performance was the Trust’s overall maturity distribution, which was underweighted in longer-term issues relative to issues with shorter maturities. This stance limited the Trust’s participation in the outperformance of longer-maturity bonds during the period. The Trust’s performance was enhanced, however, by several holdings that appreciated when they were pre-refunded.**

Reflecting a commitment to diversification, the Trust’s net assets, including preferred shares, of approximately $230 million were invested among 10 long-term sectors and 50 credits. As of the close of the period the Trust’s largest allocations were to water and sewer, transportation and dedicated tax sectors.

As discussed in previous reports, the total income available for distribution to holders of common shares includes incremental income provided by the Trust’s outstanding Auction Rate Preferred Shares (ARPS). ARPS dividends reflect prevailing short-term interest rates on maturities ranging from one week to two years. Incremental income to holders of common shares depends on two factors: the amount of ARPS outstanding and the spread between the portfolio’s cost yield and its ARPS auction rate and expenses. The greater the spread and the higher the amount of ARPS outstanding, the greater the amount of incremental income available for distribution to holders of common

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shares. The level of net investment income available for distribution to holders of common shares varies with the level of short-term interest rates. ARPS leverage also increases the price volatility of common shares and has the effect of extending portfolio duration.

During this six-month period, ARPS leverage contributed approximately $0.03 per share to common-share earnings. The Trust has four ARPS series totaling $65 million, representing 28 percent of net assets, including preferred shares. Weekly ARPS rates ranged from 2.90 to 4.00 percent during the fiscal period.

The Trust’s procedure for reinvesting all dividends and distributions in common shares is through purchases in the open market. This method helps support the market value of the Trust’s shares. In addition, we would like to remind you that the Trustees have approved a procedure whereby the Trust may, when appropriate, purchase shares in the open market or in privately negotiated transactions at a price not above market value or net asset value, whichever is lower at the time of purchase. The Trust may also utilize procedures to reduce or eliminate the amount of ARPS outstanding, including their purchase in the open market or in privately negotiated transactions.

Performance data quoted represents past performance, which is no guarantee of future results, and current performance may be lower or higher than the figures shown. Investment return, net asset value and common share market price will fluctuate and Trust shares, when sold, may be worth more or less than their original cost.

There is no guarantee that any sectors mentioned will continue to perform as discussed herein or that securities in such sectors will be held by the Trust in the future.

¹ Income earned by certain securities in the portfolio may be subject to the federal alternative minimum tax (AMT).

* A measure of the sensitivity of a bond’s price to changes in interest rates, expressed in years. Each year of duration represents an expected 1 percent change in the price of a bond for every 1 percent change in interest rates. The longer a bond’s duration, the greater the effect of interest-rate movements on its price. Typically, trusts with shorter durations perform better in rising-interest-rate environments, while trusts with longer durations perform better when rates decline. Duration calculations are adjusted for leverage.

** Prerefunding, or advance refunding, is a financing structure under which new bonds are issued to repay an outstanding bond issue on its first call date.

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TOP FIVE SECTORS
Water & Sewer					28.0	%
Transportation					18.8
Dedicated Tax					17.9
Appropriation					17.4
Education					15.6

CREDIT ENHANCEMENTS
FSA					27.2	%
MBIA					27.0
Ambac					25.7
FGIC					15.6
U.S. Government Backed					3.6
XLCA					0.9

Data as of April 30, 2007. Subject to change daily. All percentages for top five sectors are as a percentage of net assets applicable to common shareholders. All percentages for credit enhancements are as a percentage of total long-term investments. These data are provided for informational purposes only and should not be deemed a recommendation to buy or sell the securities mentioned. Morgan Stanley is a full-service securities firm engaged in securities trading and brokerage activities, investment banking, research and analysis, financing and financial advisory services.

For More Information About Portfolio Holdings

Each Morgan Stanley trust provides a complete schedule of portfolio holdings in its semiannual and annual reports within 60 days of the end of the trust’s second and fourth fiscal quarters. The semiannual reports and the annual reports are filed electronically with the Securities and Exchange Commission (SEC) on Form N-CSRS and Form N-CSR, respectively. Morgan Stanley also delivers the semiannual and annual reports to trust shareholders and makes these reports available on its public web site, www.morganstanley.com. Each Morgan Stanley trust also files a complete schedule of portfolio holdings with the SEC for the trust’s first and third fiscal quarters on Form N-Q. Morgan Stanley does not deliver the reports for the first and third fiscal quarters to shareholders, nor are the reports posted to the Morgan Stanley public web site. You may, however, obtain the Form N-Q filings (as well as the Form N-CSR and N-CSRS filings) by accessing the SEC’s web site, http://www.sec.gov. You may also review and copy them at the SEC’s public reference room in Washington, DC. Information on the operation of the SEC’s public reference room may be obtained by calling the SEC at (800) SEC-0330. You can also request copies of these materials, upon payment of a duplicating fee, by electronic request at the SEC’s e-mail address (publicinfo@sec.gov) or by writing the public reference section of the SEC, Washington, DC 20549-0102.

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	Distribution by Maturity
	(% of Long-Term Portfolio) As of April 30, 2007

Weighted Average Maturity: 18 Years^(a)

(a) Where applicable maturities reflect mandatory tenders, puts and call dates.

Portfolio structure is subject to change.

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	Call and Cost (Book) Yield Structure
	(Based on Long-Term Portfolio) As of April 30, 2007

Years Bonds Callable—Weighted Average Call Protection: 6 Years

Cost (Book) Yield^(b)—Weighted Average Book Yield: 5.0 %

(a) May include issues initially callable in previous years.

(b) Cost or ‘‘book’’ yield is the annual income earned on a portfolio investment based on its original purchase price before the Trust’s operating expenses. For example, the Trust is earning a book yield of 5.6% on 2% of the long-term portfolio that is callable in 2007.

Portfolio structure is subject to change.

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Investment Advisory Agreement Approval 

Nature, Extent and Quality of Services

The Board reviewed and considered the nature and extent of the investment advisory services provided by the Investment Adviser under the Advisory Agreement, including portfolio management, investment research and fixed income securities trading. The Board also reviewed and considered the nature and extent of the non-advisory, administrative services provided by the Trust’s Administrator under the Administration Agreement, including accounting, clerical, bookkeeping, compliance, business management and planning, and the provision of supplies, office space and utilities at the Investment Adviser’s expense. (The Investment Adviser and the Administrator together are referred to as the ‘‘Adviser’’ and the Advisory and Administration Agreements together are referred to as the ‘‘Management Agreement.’’) The Board also compared the nature of the services provided by the Adviser with similar services provided by non-affiliated advisers as reported to the Board by Lipper Inc. (‘‘Lipper’’).

The Board reviewed and considered the qualifications of the portfolio managers, the senior administrative managers and other key personnel of the Adviser who provide the administrative and advisory services to the Trust. The Board determined that the Adviser’s portfolio managers and key personnel are well qualified by education and/or training and experience to perform the services in an efficient and professional manner. The Board concluded that the nature and extent of the advisory and administrative services provided were necessary and appropriate for the conduct of the business and investment activities of the Trust. The Board also concluded that the overall quality of the advisory and administrative services was satisfactory.

Performance Relative to Comparable Funds Managed by Other Advisers

On a regular basis, the Board reviews the performance of all funds in the Morgan Stanley Fund Complex, including the Trust, compared to their peers, paying specific attention to the underperforming funds. In addition, the Board specifically reviewed the Trust’s performance for the one-, three- and five-year periods ended November 30, 2006, as shown in a report provided by Lipper (the ‘‘Lipper Report’’), compared to the performance of comparable funds selected by Lipper (the ‘‘performance peer group’’). The Board also discussed with the Adviser the performance goals and the actual results achieved in managing the Trust. The Board concluded that the Trust’s performance was competitive with that of its performance peer group.

Fees Relative to Other Proprietary Funds Managed by the Adviser with Comparable
Investment Strategies

The Board noted that the Adviser did not manage any other proprietary funds with investment strategies comparable to the Trust.

Fees and Expenses Relative to Comparable Funds Managed by Other Advisers

The Board reviewed the advisory and administrative fee (together, the ‘‘management fee’’) rate and total expense ratio of the Trust as compared to the average management fee rate and average total expense ratio for funds, selected by Lipper (the ‘‘expense peer group’’), managed by other advisers with investment strategies comparable to those of the Trust, as shown in the Lipper Report. The Board concluded that the Trust’s management fee rate and total expense ratio were competitive with those of its expense peer group.

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Breakpoints and Economies of Scale

The Board reviewed the structure of the Trust’s management fee schedule under the Management Agreement and noted that it does not include any breakpoints. The Board considered that the Trust is a closed-end fund and, therefore, that the Trust’s assets are not likely to grow with new sales or grow significantly as a result of capital appreciation. The Board concluded that economies of scale for the Trust were not a factor that needed to be considered at the present time.

Profitability of the Adviser and Affiliates

The Board considered information concerning the costs incurred and profits realized by the Adviser and affiliates during the last year from their relationship with the Trust and during the last two years from their relationship with the Morgan Stanley Fund Complex and reviewed with the Adviser the cost allocation methodology used to determine the profitability of the Adviser and affiliates. Based on its review of the information it received, the Board concluded that the profits earned by the Adviser and affiliates were not excessive in light of the advisory, administrative and other services provided to the Trust.

Fall-Out Benefits

The Board considered so-called ‘‘fall-out benefits’’ derived by the Adviser and affiliates from their relationship with the Trust and the Morgan Stanley Fund Complex, such as commissions on the purchase and sale of Trust shares and ‘‘float’’ benefits derived from handling of checks for such purchases and sales of Trust shares, through a broker-dealer affiliate of the Adviser. The Board concluded that the float benefits were relatively small and that the commissions were competitive with those of other broker-dealers.

Soft Dollar Benefits

The Board considered whether the Adviser realizes any benefits from commissions paid to brokers who execute securities transactions for the Trust (‘‘soft dollars’’). The Board noted that the Trust invests only in fixed income securities, which do not generate soft dollars.

Adviser Financially Sound and Financially Capable of Meeting the Trust’s Needs

The Board considered whether the Adviser is financially sound and has the resources necessary to perform its obligations under the Management Agreement. The Board concluded that the Adviser has the financial resources necessary to fulfill its obligations under the Management Agreement.

Historical Relationship Between the Trust and the Adviser

The Board also reviewed and considered the historical relationship between the Trust and the Adviser, including the organizational structure of the Adviser, the policies and procedures formulated and adopted by the Adviser for managing the Trust’s operations and the Board’s confidence in the competence and integrity of the senior managers and key personnel of the Adviser. The Board concluded that it is beneficial for the Trust to continue its relationship with the Adviser.

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Other Factors and Current Trends

The Board considered the controls and procedures adopted and implemented by the Adviser and monitored by the Trust’s Chief Compliance Officer and concluded that the conduct of business by the Adviser indicates a good faith effort on its part to adhere to high ethical standards in the conduct of the Trust’s business.

General Conclusion

After considering and weighing all of the above factors, the Board concluded that it would be in the best interest of the Trust and its shareholders to approve renewal of the Management Agreement for another year.

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Morgan Stanley California Insured Municipal Income Trust

Portfolio of Investments April 30, 2007 (unaudited)

PRINCIPAL AMOUNT IN THOUSANDS								COUPON RATE				MATURITY DATE				VALUE
				California Tax-Exempt Municipal Bonds (145.0%)
				General Obligation (11.3%)
$	4,970			Anaheim City School District, Ser 2007 (MBIA)					0.00	%			08/01/24			$	2,339,627
				California,
	3,000			Economic Recovery Ser 2004 A (MBIA)					5.00				07/01/15				3,242,490
	2,000			Veterans Ser BH (AMT) (FSA)					5.40				12/01/16				2,058,640
	780			Various Purpose Dtd 04/01/93 (FSA)					5.50				04/01/19				785,897
	4,000			Refg Dtd 04/01/07 (MBIA)					4.25				08/01/33				3,831,760
	2,000			Los Angeles Unified School District, Ser 2006 F (MBIA)					5.00				07/01/30				2,130,800
	3,000			Oakland, Ser 2003 A (MBIA)					5.00				01/15/33				3,129,780
	1,000			San Francisco City & County, Laguna Honda Hospital RITES PA 1387 (FSA)					7.74	‡			06/15/30				1,198,880
	20,750																18,717,874
				Appropriation (17.4%)
	4,000			Golden State Tobacco Securitization Corporation, Enhanced Asset Backed Ser 2005 A (FGIC)					5.00				06/01/38				4,196,360
	2,000			Kern County Board of Education, Refg 2006 Ser A COPs (MBIA)					5.00				06/01/31				2,114,340
	5,000			Modesto, Community Center Refg 1993 Ser A COPs (Ambac)					5.00				11/01/23				5,519,950
	140			Sacramento City Financing Authority, 2003 Capital Impr (Ambac)					5.00				12/01/33				146,341
	5,000			San Francisco Redevelopment Agency, George R Moscone Convention Center Refg Ser 2002 (FSA)					5.25				07/01/18				5,338,550
	8,000			San Jose Financing Authority, Civic Center Ser 2002 B (Ambac)					5.00				06/01/37				8,284,480
	1,000			Simi Valley Public Financing Authority, Ser 2004 COPs (Ambac)					5.00				09/01/30				1,048,400
	2,000			Val Verde Unified School District, Ser 2005 B COPs (FGIC)					5.00				01/01/35				2,096,520
	27,140																28,744,941
				Dedicated Tax (17.9%)
				Burbank Public Financing Authority,
	1,300			Golden State Redev 2003 Ser A (Ambac)					5.25				12/01/22				1,392,066
	1,500			Golden State Redev 2003 Ser A (Ambac)					5.25				12/01/23				1,603,545
	1,000			Capistrano Unified School District, Community Facilities District #98-2 Ladera Special Tax Ser 2005 (FGIC)					5.00				09/01/29				1,057,520
	2,000			Chula Vista Public Financing Authority, Ser A 2005 (MBIA)					5.00				09/01/29				2,109,280
	2,000			Culver City Redevelopment Agency, Ser 2005 A (Ambac)					5.00				11/01/25				2,109,300
	3,000			La Quinta Financing Authority, Local Agency 2004 Ser A (Ambac)					5.25				09/01/24				3,243,360
	2,000			La Quinta Redevelopment Agency, Area #1 Ser 2002 (Ambac)					5.00				09/01/22				2,116,960
	3,000			Milpitas Redevelopment Agency, Area #1 Ser 2003 (MBIA)					5.00				09/01/22				3,157,710

See Notes to Financial Statements

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Morgan Stanley California Insured Municipal Income Trust

Portfolio of Investments April 30, 2007 (unaudited) continued

PRINCIPAL AMOUNT IN THOUSANDS								COUPON RATE				MATURITY DATE				VALUE
				Poway Redevelopment Agency,
$	4,000			Paguay Redev Project 2003 Ser A (MBIA) ‡‡					5.25	%			06/15/22			$	4,259,540
	4,000			Paguay Redev Project 2003 Ser A (MBIA) ‡‡					5.25				06/15/23				4,259,540
	4,000			Paguay Redev Project 2003 Ser A (MBIA) ‡‡					5.25				06/15/24				4,259,540
	27,800																29,568,361
				Education (15.6%)
	1,000			California Infrastructure & Economic Development Bank, California Science Center Foundation Ser 2006 B (FGIC)					5.00				05/01/31				1,058,300
				California State University,
	2,000			Ser 2003 A (FGIC)					5.25				11/01/21				2,160,480
	2,000			Ser 2005 A (Ambac)					5.00				11/01/35				2,112,660
				University of California,
	2,000			Ser 2003 B (Ambac)					5.00				05/15/22				2,103,080
	5,000			Multi Purpose Ser 2003 Q (FSA)					5.00				09/01/23				5,253,350
	1,000			Limited Projects Ser 2005 B (FSA)					5.00				05/15/30				1,052,360
	4,160			Ser 2007 J (FSA) ‡‡					4.50				05/15/31				4,173,874
	3,840			Ser 2007 J (FSA) ‡‡					4.50				05/15/35				3,852,806
	4,000			Ser 2007 A (MBIA)					4.50				05/15/37				4,004,360
	25,000																25,771,270
				Hospital (3.9%)
	6,000			University of California, UCLA Medical Center Ser 2004A (Ambac)					5.25				05/15/30				6,364,380
				Housing (3.2%)
	5,000			California Department of Veterans Affairs, Home Purchase 2002 Ser A (Ambac)					5.35				12/01/27				5,335,000
				Public Power (13.3%)
	4,000			Anaheim Electric, Ser 2007-A (MBIA) ‡‡					4.50				10/01/37				3,976,900
				Los Angeles Department of Water & Power,
	4,000			2001 Ser A (FSA)					5.25				07/01/21				4,208,880
	5,000			2003 Ser A Subser A-2 (MBIA)					5.00				07/01/27				5,231,750
	4,000			Modesto Irrigation District, Ser 2001 A COPs (FSA)					5.00				07/01/26				4,149,640
	2,150			Turlock Irrigation District, Refg 1998 Ser A (MBIA)					5.00				01/01/26				2,204,352
	2,000			Puerto Rico Electric Power Authority, Ser RR (XLCA)					5.00				07/01/30				2,117,360
	21,150																21,888,882
				Transportation (18.8%)
	2,750			Long Beach Harbor, Ser 1995 (AMT) (MBIA)					5.00				05/15/24				2,881,560
	2,000			Los Angeles County Metropolitan Transportation Authority, Sales Tax Ser A (FSA)					4.50				07/01/29				2,017,100

See Notes to Financial Statements

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Morgan Stanley California Insured Municipal Income Trust

Portfolio of Investments April 30, 2007 (unaudited) continued

PRINCIPAL AMOUNT IN THOUSANDS								COUPON RATE				MATURITY DATE				VALUE
$	10,000			Los Angeles, Harbor Department 2001 A (Ambac)					5.00	%			08/01/25			$	10,430,600
	3,000			Port of Oakland, 2000 Ser K (AMT) (FGIC)					5.875				11/01/17				3,169,410
	5,000			San Francisco Airports Commission, San Francisco Int’l Airport Refg Issue 27A (AMT) (MBIA)					5.25				05/01/26				5,176,700
	1,125			San Francisco Bay Area Rapid Transit District, Sales Tax Ser 1998 (Ambac)					5.00				07/01/28				1,148,535
	2,000			San Joaquin Hills Transportation Corridor Agency, Toll Road Refg Ser 1997 A (MBIA)					5.25				01/15/30				2,041,880
	4,000			San Jose, Airport Ser 2001 A (FGIC)					5.00				03/01/25				4,153,720
	29,875																31,019,505
				Water & Sewer (28.0%)
	3,000			California Department of Water Resources, Central Valley Ser Y (FGIC)					5.25				12/01/19				3,243,600
	1,000			Camarillo Public Finance Authority, Wastewater Ser 2005 (Ambac)					5.00				06/01/36				1,055,620
				Contra Costa Water District,
	5,060			Refg Ser L (FSA)					5.00				10/01/20				5,376,351
	2,135			Refg Ser L (FSA)					5.00				10/01/21				2,268,480
	2,240			Refg Ser L (FSA)					5.00				10/01/22				2,352,560
	3,000			East Bay Municipal Utility District, Water Ser 2001(MBIA)					5.00				06/01/26				3,109,680
	1,000			Eastern Municipal Water District, Water & Sewer Refg Ser 2006 A COPs (MBIA)					5.00				07/01/32				1,058,740
	7,000			Los Angeles Wastewater, Refg Ser 2003 B (FSA)					5.00				06/01/22				7,363,020
				Metropolitan Waterworks District of Southern California,
	4,000			2003 Ser B-1 (FGIC)					5.00				10/01/33				4,192,040
	2,000			2003 Ser B-1 (FGIC)					5.00				10/01/36				2,096,020
	4,000			San Diego County Water Authority, Ser 2004 A COPs (FSA)					5.00				05/01/29				4,219,760
	5,000			San Francisco Public Utilities Commission, Water Refg Ser A 2001 (FSA)					5.00				11/01/31				5,173,950
	4,690			Santa Maria, Local Water & Refg Ser 1993 COPs (FGIC)					5.50				08/01/21				4,696,285
	44,125																46,206,106
				Refunded (15.6%)
	4,000			California Department of Water Resources, Power Supply Ser 2002 A (Ambac)					5.375				05/01/12	†			4,356,840
	4,000			California Infrastructure and Economic Development Bank, Bay Area Toll Bridges Seismic Retrofit First Lien Ser 2003 A (FSA)					5.25				07/01/13	†			4,353,960
	5,000			Los Angeles County Metropolitan Transportation Authority, Sales Tax Ser 2000 A (FGIC)					5.25				07/01/10	†			5,296,400
	3,000			Sacramento Financing Authority, Water & Capital Impr 2001 Ser A (Ambac)					5.00				06/01/11	†			3,154,440

See Notes to Financial Statements

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Morgan Stanley California Insured Municipal Income Trust

Portfolio of Investments April 30, 2007 (unaudited) continued

PRINCIPAL AMOUNT IN THOUSANDS								COUPON RATE				MATURITY DATE				VALUE
				Puerto Rico Infrastructure Financing Authority,
$	3,000			2000 Ser A (ETM)					5.375	%			10/01/24			$	3,195,840
	5,000			2000 Ser A (ETM)					5.50				10/01/32				5,346,350
	24,000																25,703,830
	230,840			Total California Tax-Exempt Municipal Bonds (Cost $229,473,167)													239,320,149
				California Tax-Exempt Short-Term Municipal Obligations (2.6%)
	2,650			Adelanto Public Utility Authority, Ser 2005 A (Ambac) (Demand 05/01/07)					3.96	*			11/01/34				2,650,000
	1,700			Metropolitan Water District of Southern California, Water 2000 Ser B-1 (Demand 05/01/07)					3.93	*			07/01/35				1,700,000
	4,350			Total California Tax-Exempt Short-Term Municipal Obligations (Cost $4,350,000)													4,350,000
	235,190			Total Investments  (Cost $233,823,167)													243,670,149
				Floating Rate Note Obligations Related to Securities Held (−9.1%)
	(15,000	)		Notes with interest rates ranging from 3.92% to 3.95% at April 30, 2007 and contractual
				maturities of collateral ranging from 06/15/22 to 10/01/37 (See Note 1D)‡‡‡ (Cost $(15,000,000))													(15,000,000	)
$	220,190			Total Net Investments  (Cost $218,823,167) (a)									138.5	%			228,670,149
				Other Assets in Excess of Liabilities									0.9				1,444,479
				Preferred Shares of Beneficial Interest									(39.4	)			(65,000,000	)
				Net Assets Applicable to Common Shareholders									100.0	%		$	165,114,628

Note: The categories of investments are shown as a percentage of net assets applicable to common shareholders.

AMT Alternative Minimum Tax.

COPs Certificates of Participation.

ETM Escrowed to Maturity.

RITES Residual Interest Tax-Exempt Security.

† Prerefunded to call date shown.

‡ Current coupon rate for inverse floating rate municipal obligation (See Note 8). This rate resets periodically as the auction rate on the related security changes. Position in an inverse floating rate municipal obligation has a total value of $1,198,880 which represents 0.7% of net assets applicable to common shareholders.

‡‡ Underlying security related to inverse floaters entered into by the Trust (See Note 1D).

‡‡‡ Floating rate note obligations related to securities held. The interest rates shown reflect the rates in effect at April 30, 2007.

* Current coupon of variable rate demand obligation.

(a) The aggregate cost for federal income tax purposes approximates the aggregate cost for book purposes. The aggregate gross unrealized appreciation is $9,907,791 and the aggregate gross unrealized depreciation is $60,809, resulting in net unrealized appreciation of $9,846,982.

Bond Insurance:

Ambac Ambac Assurance Corporation.

FGIC Financial Guaranty Insurance Company.

FSA Financial Security Assurance Inc.

MBIA Municipal Bond Investors Assurance Corporation.

XLCA XL Capital Assurance Inc.

See Notes to Financial Statements

14

Morgan Stanley California Insured Municipal Income Trust

Financial Statements

Statement of Assets and Liabilities

April 30, 2007 (unaudited)

Assets:
Investments in securities, at value     (cost $233,823,167)				$	243,670,149
Cash					86,038
Interest receivable					3,542,306
Prepaid expenses and other assets					36,580
Total Assets					247,335,073
Liabilities:
Floating rate note obligations					15,000,000
Payable for:
Investment purchased					2,037,840
Investment advisory fee					52,771
Administration fee					15,636
Transfer agent fee					2,083
Accrued expenses and other payables					112,115
Total Liabilities					17,220,445
Preferred shares of beneficial interest (at liquidation value) (1,000,000 shares authorized of non-participating $.01 par value, 1,300 shares outstanding)					65,000,000
Net Assets Applicable to Common Shareholders				$	165,114,628
Composition of Net Assets Applicable to Common Shareholders:
Common shares of beneficial interest (unlimited shares authorized of $.01 par value, 10,826,611 shares outstanding)				$	153,833,493
Net unrealized appreciation					9,846,982
Accumulated undistributed net investment income					685,201
Accumulated undistributed net realized gain					748,952
Net Assets Applicable to Common Shareholders				$	165,114,628
Net Asset Value Per Common Share
($165,114,628 divided by 10,826,611 common shares outstanding)				$	15.25

Statement of Operations

For the six months ended April 30, 2007 (unaudited)

Net Investment Income:
Interest Income				$	5,511,279
Expenses
Investment advisory fee					310,508
Interest and residual trust expenses					189,801
Administration fee					92,003
Auction commission fees					80,635
Professional fees					35,466
Auction agent fees					18,395
Shareholder reports and notices					14,384
Listing fees					10,127
Transfer agent fees and expenses					8,421
Custodian fees					5,169
Trustees’ fees and expenses					4,316
Other					28,230
Total Expenses					797,455
Less: expense offset					(5,109	)
Net Expenses					792,346
Net Investment Income					4,718,933
Net Realized and Unrealized Gain (Loss):
Net realized gain					748,987
Net change in unrealized appreciation					(1,781,690	)
Net Loss					(1,032,703	)
Dividends to preferred shareholders from net investment income					(1,051,796	)
Net Increase				$	2,634,434

See Notes to Financial Statements

15

Morgan Stanley California Insured Municipal Income Trust

Financial Statements continued

Statements of Changes in Net Assets

				FOR THE SIX MONTHS ENDED APRIL 30, 2007				FOR THE YEAR ENDED OCTOBER 31, 2006
					(unaudited	)
Increase (Decrease) in Net Assets:
Operations:
Net investment income				$	4,718,933			$	9,569,365
Net realized gain					748,987				757,321
Net change in unrealized appreciation					(1,781,690	)			3,119,034
Dividends to preferred shareholders from net investment income					(1,051,796	)			(1,896,799	)
Net Increase					2,634,434				11,548,921
Dividends and Distributions to Common Shareholders from:
Net investment income					(3,750,867	)			(7,918,339	)
Net realized gain					(341,559	)			(222,517	)
Total Dividends and Distributions					(4,092,426	)			(8,140,856	)
Decrease from transactions in common shares of beneficial interest					(1,285,630	)			(3,744,859	)
Net Decrease					(2,743,622	)			(336,794	)
Net Assets Applicable to Common Shareholders:
Beginning of period					167,858,250				168,195,044
End of Period
(Including accumulated undistributed net investment income of $685,201 and $768,931, respectively)				$	165,114,628			$	167,858,250

See Notes to Financial Statements

16

Morgan Stanley California Insured Municipal Income Trust

Notes to Financial Statements April 30, 2007 (unaudited)

1.   Organization and Accounting Policies

Morgan Stanley California Insured Municipal Income Trust (the ‘‘Trust’’) is registered under the Investment Company Act of 1940, as amended, as a diversified, closed-end management investment company. The Trust’s investment objective is to provide current income which is exempt from both federal and California income taxes. The Trust was organized as a Massachusetts business trust on November 2, 1992 and commenced operations on February 26, 1993.

The following is a summary of significant accounting policies:

A.   Valuation of Investments — (1) portfolio securities are valued by an outside independent pricing service approved by the Trustees. The pricing service uses both a computerized grid matrix of tax-exempt securities and evaluations by its staff, in each case based on information concerning market transactions and quotations from dealers which reflect the mean between the last reported bid and asked price. The portfolio securities are thus valued by reference to a combination of transactions and quotations for the same or other securities believed to be comparable in quality, coupon, maturity, type of issue, call provisions, trading characteristics and other features deemed to be relevant. The Trustees believe that timely and reliable market quotations are generally not readily available for purposes of valuing tax-exempt securities and that the valuations supplied by the pricing service are more likely to approximate the fair value of such securities; (2) futures are valued at the latest sale price on the commodities exchange on which they trade unless it is determined that such price does not reflect their market value, in which case they will be valued at their fair value as determined in good faith under procedures established by and under the supervision of the Trustees; and (3) short-term debt securities having a maturity date of more than sixty days at time of purchase are valued on a mark-to-market basis until sixty days prior to maturity and thereafter at amortized cost based on their value on the 61st day. Short-term debt securities having a maturity date of sixty days or less at the time of purchase are valued at amortized cost.

B.   Accounting for Investments — Security transactions are accounted for on the trade date (date the order to buy or sell is executed). Realized gains and losses on security transactions are determined by the identified cost method. Discounts are accreted and premiums are amortized over the life of the respective securities. Interest income is accrued daily.

C.   Futures Contracts — A futures contract is an agreement between two parties to buy and sell financial instruments or contracts based on financial indices at a set price on a future date. Upon entering into such a contract, the Trust is required to pledge to the broker cash, U.S. Government securities or other liquid portfolio securities equal to the minimum initial margin requirements of the applicable futures exchange. Pursuant to the contract, the Trust agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in the value of the contract. Such receipts or payments known as variation margin are recorded by the Trust as unrealized gains and losses. Upon closing of the contract, the Trust realizes a gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed.

17

Morgan Stanley California Insured Municipal Income Trust

Notes to Financial Statements April 30, 2007 (unaudited) continued

D.   Floating Rate Note Obligations Related to Securities Held — The Trust enters into transactions in which it transfers to Dealer Trusts (‘‘Dealer Trusts’’), fixed rate bonds in exchange for cash and residual interests in the Dealer Trusts’ assets and cash flows, which are in the form of inverse floating rate investments. The Dealer Trusts fund the purchases of the fixed rate bonds by issuing floating rate notes to third parties and allowing the Trust to retain residual interest in the bonds. The Trust enters into shortfall agreements with the Dealer Trusts which commit the Trust to pay the Dealer Trusts, in certain circumstances, the difference between the liquidation value of the fixed rate bonds held by the Dealer Trusts and the liquidation value of the floating rate notes held by third parties, as well as any shortfalls in interest cash flows. The residual interests held by the Trust (inverse floating rate investments) include the right of the Trust (1) to cause the holders of the floating rate notes to tender their notes at par at the next interest rate reset date, and (2) to transfer the municipal bond from the Dealer Trusts to the Trust, thereby collapsing the Dealer Trusts. The Trust accounts for the transfer of bonds to the Dealer Trusts as secured borrowings, with the securities transferred remaining in the Trust’s investment assets, and the related floating rate notes reflected as Trust liabilities under the caption ‘‘floating rate note obligations’’ on the ‘‘Statement of Assets and Liabilities’’. The Trust records the interest income from the fixed rate bonds under the caption ‘‘Interest Income’’ and records the expenses related to floating rate note obligations and any administrative expenses of the Dealer Trusts under the caption ‘‘Interest and residual trust expenses’’ in the Trust’s ‘‘Statement of Operations’’. The notes issued by the Dealer Trusts have interest rates that reset weekly and the floating rate note holders have the option to tender their notes to the Dealer Trusts for redemption at par at each reset date. At April 30, 2007, Trust investments with a value of $24,782,200 are held by the Dealer Trusts and serve as collateral for the $15,000,000 in floating rate note obligations outstanding at that date. Contractual maturities of the floating rate note obligations and interest rates in effect at April 30, 2007, are presented in the ‘‘Portfolio of Investments’’.

E.   Federal Income Tax Policy — It is the Trust’s policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable and nontaxable income to its shareholders. Accordingly, no federal income tax provision is required.

F.   Dividends and Distributions to Shareholders — Dividends and distributions to shareholders are recorded on the ex-dividend date.

G.   Use of Estimates — The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures. Actual results could differ from those estimates.

2.   Investment Advisory/Administration Agreements

Pursuant to an Investment Advisory Agreement with Morgan Stanley Investment Advisors Inc. (the ‘‘Investment Adviser’’) , the Trust pays an advisory fee, calculated weekly and payable monthly, by applying the annual rate of 0.27% to the Trust’s weekly total net assets including preferred shares.

18

Morgan Stanley California Insured Municipal Income Trust

Notes to Financial Statements April 30, 2007 (unaudited) continued

Pursuant to an Administration Agreement with Morgan Stanley Services Company Inc. (the ‘‘Administrator’’), an affiliate of the Investment Adviser, the Trust pays an administration fee, calculated weekly and payable monthly, by applying the annual rate of 0.08% to the Trust’s weekly total net assets including preferred shares.

3.   Security Transactions and Transactions with Affiliates

The cost of purchases and proceeds from sales of portfolio securities, excluding short-term investments, for the six months ended April 30, 2007, aggregated $20,220,511 and $17,787,488, respectively. Included in the aforementioned transactions is a purchase of $2,073,000 with Morgan Stanley California Tax-Free Income Fund.

Morgan Stanley Trust, an affiliate of the Investment Adviser and Administrator, is the Trust’s transfer agent.

The Trust has an unfunded noncontributory defined benefit pension plan covering certain independent Trustees of the Trust who will have served as independent Trustees for at least five years at the time of retirement. Benefits under this plan are based on factors which include years of service and compensation. The Trustees voted to close the plan to new participants and eliminate the future benefits growth due to increases to compensation after July 31, 2003. Aggregate pension costs for the six months ended April 30, 2007, included in Trustees’ fees and expenses in the Statement of Operations amounted to $2,295. At April 30, 2007, the Trust had an accrued pension liability of $53,351 which is included in accrued expenses in the Statement of Assets and Liabilities.

The Trust has an unfunded Deferred Compensation Plan (the ‘‘Compensation Plan’’) which allows each independent Trustee to defer payment of all, or a portion, of the fees he or she receives for serving on the Board of Trustees. Each eligible Trustee generally may elect to have the deferred amounts credited with a return equal to the total return on one or more of the Morgan Stanley funds that are offered as investment options under the Compensation Plan. Appreciation/depreciation and distributions received from these investments are recorded with an offsetting increase/decrease in the deferred compensation obligation and do not affect the net asset value of the Trust.

4.   Preferred Shares of Beneficial Interest

The Trust is authorized to issue up to 1,000,000 non-participating preferred shares of beneficial interest having a par value of $.01 per share, in one or more series, with rights as determined by the Trustees, without approval of the common shareholders. The Trust has issued Series 1 through 4 Auction Rate Preferred Shares (‘‘preferred shares’’) which have a liquidation value of $50,000 per share plus the redemption premium, if any, plus accumulated but unpaid dividends, whether or not declared, thereon to the date of distribution. The Trust may redeem such shares, in whole or in part, at the original purchase price of $50,000 per share plus accumulated but unpaid dividends, whether or not declared, thereon to the date of redemption.

19

Morgan Stanley California Insured Municipal Income Trust

Notes to Financial Statements April 30, 2007 (unaudited) continued

Dividends, which are cumulative, are reset through auction procedures.

SERIES				SHARES*				AMOUNT IN THOUSANDS*				RATE*				RESET      DATE				RANGE OF DIVIDEND RATES**
1					200			$10,000					3.80	%			05/07/07			2.90%  –  3.80%
2					400			20,000					3.60				05/07/07			3.10    –  4.00
3					500			25,000					3.70				05/07/07			3.10    –  4.00
4					200			10,000					3.60				05/07/07			2.90    –  4.00

* As of April 30, 2007.

** For the six months ended April 30, 2007.

Subsequent to April 30, 2007 and up through June 8, 2007, the Trust paid dividends to Series 1 through 4 at rates ranging from 3.15% to 3.80% in the aggregate amount of $226,992.

The Trust is subject to certain restrictions relating to the preferred shares. Failure to comply with these restrictions could preclude the Trust from declaring any distributions to common shareholders or purchasing common shares and/or could trigger the mandatory redemption of preferred shares at liquidation value.

The preferred shares, which are entitled to one vote per share, generally vote with the common shares but vote separately as a class to elect two Trustees and on any matters affecting the rights of the preferred shares.

5.   Common Shares of Beneficial Interest

Transactions in common shares of beneficial interest were as follows:

				SHARES				PAR VALUE				CAPITAL PAID IN EXCESS OF     PAR VALUE
Balance, October 31, 2005					11,182,811			$	111,828			$	158,752,154
Treasury shares purchased and retired (weighted average discount 7.14%)*					(267,600	)			(2,676	)			(3,742,183	)
Balance, October 31, 2006					10,915,211				109,152				155,009,971
Treasury shares purchased and retired (weighted average discount 5.19%)*					(88,600	)			(886	)			(1,284,744	)
Balance, April 30, 2007					10,826,611			$	108,266			$	153,725,227

* The Trustees have voted to retire the shares purchased.

20

Morgan Stanley California Insured Municipal Income Trust

Notes to Financial Statements April 30, 2007 (unaudited) continued

6.   Dividends to Common Shareholders

On March 26, 2007, the Trust declared the following dividends from net investment income:

AMOUNT PER SHARE				RECORD       DATE				PAYABLE         DATE
$0.0575				May 4, 2007				May 18, 2007
$0.0575				June 8, 2007				June 22, 2007

7.   Expense Offset

The expense offset represents a reduction of the fees and expenses for interest earned on cash balances maintained by the Trust with the transfer agent and custodian.

8.   Purposes of and Risks Relating to Certain Financial Instruments

The Trust may invest a portion of its assets in inverse floating rate instruments, either through outright purchases of inverse floating rate securities or through the transfer of bonds to Dealer Trusts in exchange for cash and residual interests in the Dealer Trusts. These investments are typically used by the Trust in seeking to enhance the yield of the portfolio. These instruments typically involve greater risks than a fixed rate municipal bond. In particular, these instruments are acquired through leverage or may have leverage embedded in them and therefore involve many of the risks associated with leverage. Leverage is a speculative technique that may expose the Trust to greater risk and increased costs. Leverage may cause the Trust’s net asset value to be more volatile than if it had not been leveraged because leverage tends to magnify the effect of any increases or decreases in the value of the Trust’s portfolio securities. The use of leverage may also cause the Trust to liquidate portfolio positions when it may not be advantageous to do so in order to satisfy its obligations with respect to inverse floating rate instruments.

To hedge against adverse interest rate changes, the Trust may invest in financial futures contracts or municipal bond index futures contracts (‘‘futures contracts’’).

These futures contracts involve elements of market risk in excess of the amount reflected in the Statement of Assets and Liabilities. The Trust bears the risk of an unfavorable change in the value of the underlying securities. Risks may also arise upon entering into these contracts from the potential inability of the counterparties to meet the terms of their contracts.

9.   Federal Income Tax Status

The amount of dividends and distributions from net investment income and net realized capital gains are determined in accordance with federal income tax regulations which may differ from generally accepted accounting principles. These ‘‘book/tax’’ differences are either considered temporary or permanent in nature. To the extent these differences are permanent in nature, such amounts are reclassified within the capital accounts based on their federal tax-basis treatment; temporary differences do not require reclassification.

21

Morgan Stanley California Insured Municipal Income Trust

Notes to Financial Statements April 30, 2007 (unaudited) continued

Dividends and distributions which exceed net investment income and net realized capital gains for tax purposes are reported as distributions of paid-in-capital.

As of October 31, 2006, the Trust had temporary book/tax differences primarily attributable to book amortization of discounts on debt securities and dividend payable.

10.   Accounting Pronouncements

In July 2006, the Financial Accounting Standards Board (FASB) issued Interpretation 48, Accounting for Uncertainty in Income Taxes – an interpretation of FASB Statement 109 (FIN 48). FIN 48 clarifies the accounting for income taxes by prescribing the minimum recognition threshold a tax position must meet before being recognized in the financial statements. FIN 48 is effective for fiscal years beginning after December 15, 2006, and is to be applied to all open tax years as of the effective date. The impact to the Trust’s financial statements, if any, is currently being assessed.

In addition, in September 2006, Statement of Financial Accounting Standards No. 157, Fair Value Measurements (SFAS 157), was issued and is effective for fiscal years beginning after November 15, 2007. SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Management is currently evaluating the impact the adoption of SFAS 157 will have on the Trust’s financial statement disclosures.

22

Morgan Stanley California Insured Municipal Income Trust

Financial Highlights

Selected ratios and per share data for a common share of beneficial interest outstanding throughout each period:

				FOR THE SIX MONTHS ENDED APRIL 30, 2007				FOR THE YEAR ENDED OCTOBER 31,
								2006				2005				2004				2003				2002
				(unaudited)
Selected Per Share Data:
Net asset value, beginning of period				$	15.38			$	15.04			$	15.00			$	14.84			$	15.00			$	15.07
Income (loss) from investment     operations:
Net investment income*					0.43				0.87				0.86				0.86				0.92				1.00
Net realized and unrealized gain (loss)					(0.09	)			0.35				(0.05	)			0.22				(0.12	)			(0.14	)
Common share equivalent of dividends paid to preferred shareholders*					(0.10	)			(0.17	)			(0.11	)			(0.10	)			(0.08	)			(0.11	)
Total income from investment operations					0.24				1.05				0.70				0.98				0.72				0.75
Less dividends and distributions from:
Net investment income					(0.35	)			(0.72	)			(0.72	)			(0.80	)			(0.89	)			(0.82	)
Net realized gain					(0.03	)			(0.02	)			—				(0.07	)			—				—
Total dividends and distributions					(0.38	)			(0.74	)			(0.72	)			(0.87	)			(0.89	)			(0.82	)
Anti-dilutive effect of acquiring treasury     shares*					0.01				0.03				0.06				0.05				0.01				0.00
Net asset value, end of period				$	15.25			$	15.38			$	15.04			$	15.00			$	14.84			$	15.00
Market value, end of period				$	14.83			$	14.46			$	13.54			$	13.63			$	13.87			$	14.38
Total Return†					5.22	% (1)			12.51	%			4.74	%			4.78	%			2.61	%			4.41	%
Ratios to Average Net Assets of     Common Shareholders:
Total expenses (before expense offset)					0.96	% (2)			0.89	%			0.79	% (3)			0.81	% (3)			0.77	% (3)			0.74	% (3)
Total expenses (before expense offset,     exclusive of interest and residual     trust expenses)					0.73	% (2)			0.76	%			0.79	% (3)			0.81	% (3)			0.77	% (3)			0.74	% (3)
Net investment income before preferred     stock dividends					5.71	% (2)			5.75	%			5.63	%			5.82	%			6.14	%			6.75	%
Preferred stock dividends					1.27	% (2)			1.14	%			0.74	%			0.67	%			0.56	%			0.77	%
Net investment income available to     common shareholders					4.44	% (2)			4.61	%			4.89	%			5.15	%			5.58	%			5.98	%
Supplemental Data:
Net assets applicable to common     shareholders, end of period, in     thousands					$165,115				$167,858				$168,195				$173,758				$178,537				$183,538
Asset coverage on preferred shares at     end of period					354	%			358	%			359	%			367	%			374	%			382	%
Portfolio turnover rate					8	% (1)			5	%			13	%			16	%			64	%			16	%

* The per share amounts were computed using an average number of common shares outstanding during the period.

† Total return is based upon the current market value on the last day of each period reported. Dividends and distributions are assumed to be reinvested at the prices obtained under the Trust’s dividend reinvestment plan. Total return does not reflect brokerage commissions.

(1) Not annualized.

(2) Annualized.

(3) Does not reflect the effect of expense offset of 0.01%.

See Notes to Financial Statements

23

Trustees Frank L. Bowman Michael Bozic Kathleen A. Dennis James F. Higgins Dr. Manuel H. Johnson Joseph J. Kearns Michael F. Klein Michael E. Nugent W. Allen Reed Fergus Reid Officers Michael E. Nugent Chairperson of the Board Ronald E. Robison President and Principal Executive Officer J. David Germany Vice President Dennis F. Shea Vice President Amy R. Doberman Vice President Carsten Otto Chief Compliance Officer Stefanie V. Chang Yu Vice President Francis J. Smith Treasurer and Chief Financial Officer Mary E. Mullin Secretary Transfer Agent Morgan Stanley Trust Harborside Financial Center, Plaza Two Jersey City, New Jersey 07311 Independent Registered Public Accounting Firm Deloitte & Touche LLP Two World Financial Center New York, New York 10281 Legal Counsel Clifford Chance US LLP 31 West 52nd Street New York, New York 10019 Counsel to the Independent Trustees Kramer Levin Naftalis & Frankel LLP 1177 Avenue of the Americas New York, New York 10036 Investment Adviser Morgan Stanley Investment Advisors Inc. 1221 Avenue of the Americas New York, New York 10020 The financial statements included herein have been taken from the records of the Trust without examination by the independent auditors and accordingly they do not express an opinion thereon. © 2007 Morgan Stanley IICSAN-IU07-01574P-Y04/07		MORGAN STANLEY FUNDS
		Morgan Stanley California Insured Municipal Income Trust Semiannual Report April 30, 2007

Item 2.  Code of Ethics.

Not applicable for semiannual reports.


Item 3.  Audit Committee Financial Expert.

Not applicable for semiannual reports.


Item 4. Principal Accountant Fees and Services

Not applicable for semiannual reports.


Item 5. Audit Committee of Listed Registrants.

Not applicable for semiannual reports.


Item 6.

Refer to Item 1.


Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End
Management Investment Companies.

Not applicable for semiannual reports.


Item 8. Portfolio Managers of Closed-End Management Investment Companies

Applicable only to reports covering periods ending on or after December 31,
2005.












Item 9. Closed-End Fund Repurchases



                        REGISTRANT PURCHASE OF EQUITY SECURITIES
- ---------------------- -------------- ----------------- ---------------- -----------------
Period                 (a) Total      (b) Average       (c) Total        (d) Maximum
                        Number of     Price Paid per    Number of        Number (or
                       Shares (or     Share (or Unit)   Shares (or       Approximate
                       Units)                           Units)           Dollar Value)
                       Purchased                        Purchased as     of Shares (or
                                                        Part of          Units) that May
                                                        Publicly         Yet Be
                                                        Announced        Purchased Under
                                                        Plans or         the Plans or
                                                        Programs         Programs
- ---------------------- -------------- ----------------- ---------------- -----------------

November 1, 2006--
November 30, 2006      16,800         14.5417                 N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------
December 1, 2006--
December 31, 2006      11,800         14.5859                 N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------
January 1, 2007--
January 31, 2007       14,500         14.4519                 N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------
February 1, 2007--
February 28, 2007      30,200         14.4110                 N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------
March 1, 2007--
March 31, 2007         15,300         14.5999                 N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------
April 1, 2007--
April 30, 2007               -               -                N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------
Total                  88,600         14.5181                 N/A              N/A
- ---------------------- -------------- ----------------- ---------------- -----------------



Item 10. Submission of Matters to a Vote of Security Holders

Not applicable.


Item 11. Controls and Procedures

a) The Trust's principal executive officer and principal financial officer have
concluded that the Trust's disclosure controls and procedures are sufficient to
ensure that information required to be disclosed by the Trust in this Form N-CSR
was recorded, processed, summarized and reported within the time periods specified
in the Securities and Exchange Commission's rules and forms, based upon such
officers' evaluation of these controls and procedures as of a date within 90
days of the filing date of the report.

                                       2



(b) There were no changes in the registrant's internal control over financial
reporting that occurred during the second fiscal quarter of the period covered
by this report that have materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial reporting.


Item 12. Exhibits

(a) Code of Ethics - Not applicable for semiannual reports.

(b) A separate certification for each principal executive officer and principal
financial officer of the registrant are attached hereto as part of EX-99.CERT.















                                       3




                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934 and
the Investment Company Act of 1940, the registrant has duly caused this report
to be signed on its behalf by the undersigned, thereunto duly authorized.

Morgan Stanley California Insured Municipal Income Trust

/s/ Ronald E. Robison
Ronald E. Robison
Principal Executive Officer
June 21, 2007

         Pursuant to the requirements of the Securities Exchange Act of 1934 and
the Investment Company Act of 1940, this report has been signed by the following
persons on behalf of the registrant and in the capacities and on the dates
indicated.

/s/ Ronald E. Robison
Ronald E. Robison
Principal Executive Officer
June 21, 2007

/s/ Francis Smith
Francis Smith
Principal Financial Officer
June 21, 2007












                                       4




                                                                   EXHIBIT 12 B1

                  CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

                                 CERTIFICATIONS
                                 --------------

I, Ronald E. Robison, certify that:

1.   I have reviewed this report on Form N-CSR of Morgan Stanley California
     Insured Municipal Income Trust;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material fact or omit to state a material fact necessary to make the
     statements made, in light of the circumstances under which such statements
     were made, not misleading with respect to the period covered by this
     report;

3.   Based on my knowledge, the financial statements and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations, changes in net
     assets, and cash flows (if the financial statements are required to include
     a statement of cash flows) of the registrant as of, and for, the periods
     presented in this report;

4.   The registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Rule 30a-3(c) under the Investment Company Act of 1940) and internal
     control over financial reporting (as defined in Rule 30a-3(d) under the
     Investment Company Act of 1940) for the registrant and have:

a)   designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

b)   designed such internal control over financial reporting, or caused such
     internal control over financial reporting to be designed under our
     supervision, to provide reasonable assurance regarding the reliability of
     financial reporting and the preparation of financial statements for
     external purposes in accordance with generally accepted accounting
     principles;

c)   evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of a date
     within 90 days prior to the filing date of this report based on such
     evaluation; and

d)   disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the second fiscal quarter of
     the period covered by this report that has materially affected, or is
     reasonably likely to materially affect, the registrant's internal control
     over financial reporting; and

5.   The registrant's other certifying officer(s) and I have disclosed to the
     registrant's auditors and the audit committee of the registrant's board of
     directors (or persons performing the equivalent functions):

                                       5


a)   all significant deficiencies and material weaknesses in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely affect the registrant's ability to record, process,
     summarize, and report financial information; and

b)   any fraud, whether or not material, that involves management or other
     employees who have a significant role in the registrant's internal controls
     over financial reporting.

Date: June 21, 2007
                                                     /s/ Ronald E. Robison
                                                     Ronald E. Robison
                                                     Principal Executive Officer







































                                       6




                                                                   EXHIBIT 12 B2

                  CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

                                 CERTIFICATIONS
                                 --------------

I, Francis Smith, certify that:

1.   I have reviewed this report on Form N-CSR of Morgan Stanley California
     Insured Municipal Income Trust;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material fact or omit to state a material fact necessary to make the
     statements made, in light of the circumstances under which such statements
     were made, not misleading with respect to the period covered by this
     report;

3.   Based on my knowledge, the financial statements and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations, changes in net
     assets, and cash flows (if the financial statements are required to include
     a statement of cash flows) of the registrant as of, and for, the periods
     presented in this report;

4.   The registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Rule 30a-3(c) under the Investment Company Act of 1940) and internal
     control over financial reporting (as defined in Rule 30a-3(d) under the
     Investment Company Act of 1940) for the registrant and have:

a)   designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

b)   designed such internal control over financial reporting, or caused such
     internal control over financial reporting to be designed under our
     supervision, to provide reasonable assurance regarding the reliability of
     financial reporting and the preparation of financial statements for
     external purposes in accordance with generally accepted accounting
     principles;

c)   evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of a date
     within 90 days prior to the filing date of this report based on such
     evaluation; and

d)   disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the second fiscal quarter of
     the period covered by this report that has materially affected, or is
     reasonably likely to materially affect, the registrant's internal control
     over financial reporting; and

5.   The registrant's other certifying officer(s) and I have disclosed to the
     registrant's auditors and the audit committee of the registrant's board of
     directors (or persons performing the equivalent functions):

                                       7


a)   all significant deficiencies and material weaknesses in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely affect the registrant's ability to record, process,
     summarize, and report financial information; and

b)   any fraud, whether or not material, that involves management or other
     employees who have a significant role in the registrant's internal controls
     over financial reporting.

Date: June 21, 2007
                                                   /s/ Francis Smith
                                                   Francis Smith
                                                   Principal Financial  Officer




































                                       8




                            SECTION 906 CERTIFICATION

                Certification Pursuant to 18 U.S.C. Section 1350,
                             As Adopted Pursuant to
                  Section 906 of the Sarbanes-Oxley Act of 2002

Morgan Stanley California Insured Municipal Income Trust

         In connection with the Report on Form N-CSR (the "Report") of the
above-named issuer for the period ended April 30, 2007 that is accompanied by
this certification, the undersigned hereby certifies that:

1.       The Report fully complies with the requirements of Section 13(a) or
         15(d) of the Securities Exchange Act of 1934; and

2.       The information contained in the Report fairly presents, in all
         material respects, the financial condition and results of operations of
         the Issuer.



Date: June 21, 2007                                 /s/ Ronald E. Robison
                                                    ---------------------------
                                                    Ronald E. Robison
                                                    Principal Executive Officer


A signed original of this written statement required by Section 906 has been
provided to Morgan Stanley California Insured Municipal Income Trust and will be
retained by Morgan Stanley California Insured Municipal Income Trust and
furnished to the Securities and Exchange Commission or its staff upon request.















                                       9



                            SECTION 906 CERTIFICATION

                Certification Pursuant to 18 U.S.C. Section 1350,
                             As Adopted Pursuant to
                  Section 906 of the Sarbanes-Oxley Act of 2002

Morgan Stanley California Insured Municipal Income Trust

         In connection with the Report on Form N-CSR (the "Report") of the
above-named issuer for the period ended April 30, 2007 that is accompanied by
this certification, the undersigned hereby certifies that:

1.       The Report fully complies with the requirements of Section 13(a) or
         15(d) of the Securities Exchange Act of 1934; and

2.       The information contained in the Report fairly presents, in all
         material respects, the financial condition and results of operations of
         the Issuer.



Date: June 21, 2007                               /s/ Francis Smith
                                                  ----------------------
                                                  Francis Smith
                                                  Principal Financial Officer


A signed original of this written statement required by Section 906 has been
provided to Morgan Stanley California Insured Municipal Income Trust and will be
retained by Morgan Stanley California Insured Municipal Income Trust and
furnished to the Securities and Exchange Commission or its staff upon request.

















                                       10