This bulletin summary lists security bulletins released for May 2009.
With the release of the bulletins for May 2009, this bulletin summary replaces the bulletin advance notification originally issued May 7, 2009. For more information about the bulletin advance notification service, see Microsoft Security Bulletin Advance Notification.

For information about how to receive automatic notifications whenever Microsoft security bulletins are issued, visit Microsoft Technical Security Notifications.

Microsoft is hosting a webcast to address customer questions on these bulletins on May 13, 2009, at 11:00 AM Pacific Time (US & Canada). Register now for the May Security Bulletin Webcast. After this date, this webcast is available on-demand. For more information, see Microsoft Security Bulletin Summaries and Webcasts.