INVESTOR Annual Report 2006

INVESTOR RELATIONS

www.microsoft.com/investor

Investor Relations

You can contact the Microsoft Investor Relations group at any time to order financial documents such as annual reports and Form 10-Ks free of charge.

Call us toll-free at (800) 285-7772 or outside the United States, call (425) 706-4400. We can be contacted between the hours of 8:30 a.m. to 5:30 p.m. Pacific time to answer investment oriented questions about Microsoft.

For access to additional financial information, visit the Investor Relations website online at:
www.microsoft.com/investor

You may also contact us by fax at (425) 706-8000.

Our e-mail is msft@microsoft.com

Our mailing address is:
    Investor Relations
    Microsoft Corporation
    One Microsoft Way
    Redmond, Washington 98052-6399

Annual Meeting

8:00 a.m. Pacific time November 14, 2006
Meydenbauer Center
11100 NE 6th Street
Bellevue, Washington 98004

Registered Shareholder Services

Mellon Investor Services, our transfer agent can help you with a variety of shareholder related services including:

Change of address
Lost stock certificates
Transfer of stock to another person
Additional administrative services

Mellon Investor Services also administers a direct stock purchase plan and a dividend reinvestment program for the company.

To find out more about these services and programs you may contact Mellon directly at 800-285-7772, option 4 between the hours of 6:00 a.m. and 4:00 p.m. Pacific time, Monday through Friday or visit Mellon’s Investor Service Direct^(SM) online at:
http://www.melloninvestor.com/isd

You can e-mail the transfer agent at:
msft@melloninvestor.com

You can also send mail to the transfer agent at
    Mellon Investor Services
    P.O. Box 3315
    South Hackensack, NJ
    07606-1915

Shareholders of record who receive more than one copy of this annual report can contact our transfer agent and arrange to have their accounts consolidated. Shareholders who own Microsoft stock through a brokerage account can contact their broker to request consolidation of their accounts.

Shareholders can sign up for electronic alerts to access the Annual Report and Proxy Statement online. The service gets you the information you need faster and also gives you the power and convenience of online proxy voting. To sign up for this free service, visit the Open Enrollment site on the Investor Relations website at:
http://www.microsoft.com/investor/openenroll.mspx