Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 Sample Contracts

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 29th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 30th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 27th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 29th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 27th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 30th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 2nd, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 4th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (May 4th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (April 5th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (March 3rd, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (February 4th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (January 7th, 2004)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 4th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 4th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 9th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 9th, 2003)

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 25, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 8th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 07/2003 DISTRIBUTION REPORT SERIES: wamms 2003-ms7 WEIGHTED AVERAGE PC RATE: 5.88031% POOL NUMBER: Group 1 = 2047 ____________________________________________________________________________________________ ISSUE DATE: 02/27/2003 CERTIFICATE BALANCE AT ISSUE: $459,536,675.85 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 7th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 06/2003 DISTRIBUTION REPORT SERIES: wamms 2003-ms7 WEIGHTED AVERAGE PC RATE: 5.89007% POOL NUMBER: Group 1 = 2047 ____________________________________________________________________________________________ ISSUE DATE: 02/27/2003 CERTIFICATE BALANCE AT ISSUE: $459,536,675.85 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 10th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 04/2003 DISTRIBUTION REPORT SERIES: wamms 2003-ms7 WEIGHTED AVERAGE PC RATE: 5.90128% POOL NUMBER: Group 1 = 2047 ____________________________________________________________________________________________ ISSUE DATE: 02/27/2003 CERTIFICATE BALANCE AT ISSUE: $459,536,675.85 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (May 12th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 04/2003 DISTRIBUTION REPORT SERIES: wamms 2003-ms7 WEIGHTED AVERAGE PC RATE: 5.90128% POOL NUMBER: Group 1 = 2047 ____________________________________________________________________________________________ ISSUE DATE: 02/27/2003 CERTIFICATE BALANCE AT ISSUE: $459,536,675.85 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (April 10th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 03/2003 DISTRIBUTION REPORT SERIES: wamms 2003-ms7 WEIGHTED AVERAGE PC RATE: 5.90422% POOL NUMBER: Group 1 = 2047 ____________________________________________________________________________________________ ISSUE DATE: 02/27/2003 CERTIFICATE BALANCE AT ISSUE: $459,536,675.85 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Series 2003-Ms7 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., (March 17th, 2003)

EXECUTION VERSION WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and Master Servicer and U.S. BANK NATIONAL ASSOCIATION, as Trustee and CHRISTIANA BANK & TRUST COMPANY, as Delaware Trustee POOLING AND SERVICING AGREEMENT $459,536,674.87 Washington Mutual Mortgage Securities Corp. Washington Mutual MSC Mortgage Pass-Through Certificates Series 2003-MS7 Cut-Off Date: February 1, 2003 TABLE OF CONTENTS