Microsoft Security bulletins have been released for May, 2010.

1. Microsoft Security Bulletin MS10-030 - Critical
Vulnerability in Outlook Express and Windows Mail Could Allow Remote Code Execution (978542)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-030.mspx

2. Microsoft Security Bulletin MS10-031 - Critical
Vulnerability in Microsoft Visual Basic for Applications Could Allow Remote Code Execution (978213)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-031.mspx