On Tuesday, Microsoft will release eight security bulletins, two rated critical and six rated important, to fix 23 vulnerabilities. These will fix holes in Internet Explorer, .NET Framework & Silverlight, Microsoft Windows, Microsoft Forefront UAG, and Microsoft Host Integration Server.
The critical patches affects all supported versions of Windows: XP, Vista and Windows 7, Windows Server 2033, 2008 and R2 (not Server Core), and all supported versions of IE, including IE 9. There's a sprinkling of patches rated important affecting all versions of Windows, too.