EDGAR Filing Documents for 0001104659-07-050937

Form N-CSRS - Certified Shareholder Report, Semi-Annual:

SEC Accession No. 0001104659-07-050937

Filing Date

2007-06-29

Accepted

2007-06-28 18:19:18

Documents

Period of Report

2007-04-30

Effectiveness Date

2007-06-29

Document Format Files

Seq	Description	Document	Type	Size
1	N-CSRS	a07-15137_1ncsrs.htm	N-CSRS	618595
2	EX-99.CERT	a07-15137_1ex99dcert.htm	EX-99.CERT	21325
3	EX-99.906CERT	a07-15137_1ex99d906cert.htm	EX-99.906CERT	12144
4	GRAPHIC	j07151372_za006.jpg	GRAPHIC	6757
5	GRAPHIC	j07151372_za007.jpg	GRAPHIC	22244
	Complete submission text file	0001104659-07-050937.txt		694933

Series and Classes/Contracts Information:

Existing
	Status	Name	Ticker Symbol
CIK 0000806564
Series S000002467		Morgan Stanley Mortgage Securities Trust
Class/Contract C000006611		A	MTGAX
Class/Contract C000006612		B	MTGBX
Class/Contract C000006613		C	MTGCX
Class/Contract C000006614		D	MTGDX

Mailing Address C/O MORGAN STANLEY TRUST HAROBORSIDE FINANCIAL CENTER, PLAZA TWO JERSEY CITY NJ 07311

Business Address C/O MORGAN STANLEY TRUST HARBORSIDE FINANCIAL CENTER JERSEY CITY NJ 07311 (212) 869-6397

MORGAN STANLEY MORTGAGE SECURITIES TRUST (Filer) CIK: 0000806564 (see all company filings)