MORGAN STANLEY MID-CAP VALUE FUND
                     1221 Avenue of the Americas
                          New York, NY 10020

December 11, 2006

Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C.  20549

Attention:    Larry Greene
              Division of Investment Management

RE:      MORGAN STANLEY MID-CAP VALUE FUND
         (FILE NOS. 333-59140 AND 811-10359)

Dear Mr. Greene:

Thank you for your telephonic comments on November 30, 2006 regarding the
registration statement on Form N-1A for Morgan Stanley Mid-Cap Value Fund (the
"Fund") filed with the Securities and Exchange Commission on October 26, 2006.
Below, we provide responses or any supplemental explanations to the Staff's
comments, as requested. Post-effective amendment number 7 to the Fund's
registration statement on Form N-1A, will be filed via EDGAR on or about
December 11, 2006.

           GENERAL COMMENTS TO FORM N-1A

COMMENT 1. PLEASE FILE A RESPONSE LETTER TO THESE COMMENTS VIA EDGAR, INCLUDING
           THE "TANDY" PROVISION.

               RESPONSE 1. This response letter addressing the Staff's comments
               has been filed via EDGAR correspondence, including the "Tandy"
               provision, separate from the corresponding Post-Effective
               Amendment.

           COMMENTS TO THE PROSPECTUS

COMMENT 2. PLEASE NOTE THAT CERTAIN SIDEBARS IN THE PROSPECTUS APPEAR
           IN ALL CAPS IN THE EDGAR FILINGS WITH THE COMMISSION. PLEASE CONFIRM
           THAT THEY ARE NOT IN ALL CAPS AS THEY APPEAR IN THE PRINTED
           PROSPECTUS.

               RESPONSE 2. This disclosure appears in italics in the Fund's
               printed prospectus, not all caps.


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COMMENT 3. IN THE "PRINCIPAL INVESTMENT STRATEGIES" SECTION OF THE PROSPECTUS,
           THE FUND MAY INVEST IN OPTIONS AND FUTURES. PLEASE CONFIRM THAT THE
           REGISTRATION STATEMENT INCLUDES DISCLOSURE CONCERNING THE SEGREGATION
           OF ASSETS WHEN MAKING THESE TYPES OF INVESTMENTS.

               RESPONSE 3. The Fund respectfully submits that such disclosure
               can be found in the "II. Description of the Fund and Its
               Investment Risks - B. Investment Strategies and Risks - Options
               and Futures Transactions" section of the Statement of Additional
               Information for the Fund.

COMMENT 4. IN THE "PRINCIPAL INVESTMENT STRATEGIES" SECTION OF THE PROSPECTUS,
           THE FUND MAY INVEST IN REAL ESTATE INVESTMENT TRUSTS. PLEASE CONFIRM
           THAT THE REGISTRATION STATEMENT INCLUDES DISCLOSURE CONCERNING ANY
           DUPLICATIVE EXPENSES THAT MAY BE PAID BY SHAREHOLDERS TO THE EXTENT
           THAT THE FUND INVESTS IN REITS.

               RESPONSE 4. The Fund respectfully submits that such disclosure
               can be found in the "Principal Risks - Real Estate Investment
               Trusts" section of the Fund's prospectus.

COMMENT 5. CONSIDER INCLUDING THE ORDER PROCESSING FEE IN THE FEE TABLE.

               RESPONSE 5. The Order Processing Fee is not a fee imposed by the
               Fund. It is a fee that Morgan Stanley DW Inc. charges its
               clients. Thus, it should not be included in the fee table.

As you have requested and consistent with SEC Release 2004-89, the Fund hereby
acknowledges that:

     o    the Fund is responsible for the adequacy and accuracy of the
          disclosure in the filings;

     o   the Staff's comments or changes to disclosure in response to Staff
         comments in the filings reviewed by the Staff do not foreclose the
         Commission from taking any action with respect to the filings; and

     o   the Fund may not assert Staff comments as a defense in any proceeding
         initiated by the Commission or any person under the federal securities
         laws of the United States.

If you would like to discuss any of these responses in further detail or if you
have any questions, please feel free to contact me at (630) 684-6724. Thank you.

Sincerely,
/s/ Elisa Mitchell
Elisa Mitchell

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