Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 Sample Contracts

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 23rd, 2004)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 03/2003 DISTRIBUTION REPORT SERIES: wamms 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.61062% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 23rd, 2004)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 04/2003 DISTRIBUTION REPORT SERIES: wamms 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.60779% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 4th, 2004)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (May 4th, 2004)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (April 5th, 2004)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (March 3rd, 2004)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (February 4th, 2004)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – POOLING AND SERVICING AGREEMENT (January 26th, 2004)

Exhibit 7.1 FIRST AMENDMENT TO POOLING AND SERVICING AGREEMENT WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATES SERIES 2002-MS10 This first amendment (this "Amendment") to the Pooling and Servicing Agreement, dated and effective as of December 1, 2002 (the "Pooling Agreement") respecting the Washington Mutual MSC Mortgage Pass-Through Certificates Series 2002-MS10 (the "Certificates"), by and among Washington Mutual Mortgage Securities Corp., as depositor and Master Servicer (the "Company"), U.S. Bank National Association, successor in interest to State Street Bank and Trust Company, as Trustee (the "Trustee"), and Christiana Bank & Trust Company, as Delaware Trustee (the "Delaware Trustee"), is made as of July 24, 2003 by and between the Company and the Trustee.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (January 7th, 2004)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 4th, 2003)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 4th, 2003)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 9th, 2003)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 4th, 2003)

The Group C-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 December 20, 2002 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 C-B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 11th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 07/2003 DISTRIBUTION REPORT SERIES: wamms 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.59539% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – 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 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.60045% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 10th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 05/2003 DISTRIBUTION REPORT SERIES: wamms 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.59829% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (March 10th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 02/2003 DISTRIBUTION REPORT SERIES: wamms 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.61390% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (February 10th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 01/2003 DISTRIBUTION REPORT SERIES: wamms 2002-ms10 WEIGHTED AVERAGE PC RATE: 5.61428% POOL NUMBER: Group 1 = 2003, 2004 ____________________________________________________________________________________________ ISSUE DATE: 12/30/2002 CERTIFICATE BALANCE AT ISSUE: $371,165,799.04 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Washington Mutual Msc Mort Pass Thru Cert Ser 2002-Ms10 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., (January 7th, 2003)

EXECUTION VERSION WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and Master Servicer and STATE STREET BANK AND TRUST COMPANY, as Trustee and CHRISTIANA BANK & TRUST COMPANY, as Delaware Trustee POOLING AND SERVICING AGREEMENT $371,165,797.83 Washington Mutual Mortgage Securities Corp. Washington Mutual MSC Mortgage Pass-Through Certificates Series 2002-MS10 Cut-Off Date: December 1, 2002 TABLE OF CONTENTS