Media Alert Microsoft Will Discuss Sasser Worm Arrest

What: Microsoft Corp. will hold a press teleconference to discuss the Sasser Worm arrest in Germany and provide details on anti-virus reward connection.

Who: Brad Smith, senior vice president, general counsel and corporate secretary, Law and Corporate Affairs

When: Today, May 8, 2004

The news conference call will begin at 9 a.m. PDT/noon EDT.

Listen-only news conference with question and answer session following:

United States (877) 298-1007 ID No. 7407283

International +1 (706) 643-9640 ID No. 7407283

Reporters and editors should visit http://www.microsoft.com/presspass/ for frequent updates from Microsoft.

Audio Replay Information

An audio replay of the news conference will be available approximately one hour after the conference call has ended, until June 8, 2004.

Replay Call-In Numbers

United States (800) 642-1687 ID No. 7407283

International +1 (706) 645-9291 ID No. 7407283

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For more information, print and online media only:

Shaun Wootton for European media: +44 20 7269 4783

Marc Lallaman, Waggener Edstrom, (503) 443-7228, marcl@wagged.com

For more information, global electronic media only:

Media Relations, Global Communications & Television, (212) 339-9920, mediarelations@gctv.com

Note to editors: If you are interested in viewing additional information on Microsoft, please visit the Microsoft®
Web page at http://www.microsoft.com/presspass/ on Microsoft’s corporate information pages. Web links, telephone numbers and titles were correct at time of publication, but may since have changed. For additional assistance, journalists and analysts may contact Microsoft’s Rapid Response Team or other appropriate contacts listed at http://www.microsoft.com/presspass/contactpr.asp .