As expected, Microsoft released a record-breaking, massive number of patches last April 11, 2011 that affects all versions of Windows and Office (which includes its cloud apps) and addresses some long-standing holes that hackers have been exploiting in the wild.
17 security bulletins fix a whopping 64 holes. These include nine critical patches and eight important. Of the critical patches, five of them have the highest "exploitability index" rating of 1, meaning that the risk of attack is high and the impact of being pwned is also high. Today's Patch Tuesday is a record-breaker in the number of holes fixed. In December, 2010, Microsoft released 17 patches, too, but these fixed a total of 40 holes.
Affected software runs the gamut. There are patches for all supported versions of Windows, including XP, Vista, Windows 7, Windows Server 2008 R2 and even the non-GUI WS2008 Server Core version.
Additionally, Microsoft issued patches for all versions of Office, including patch MS11-022, for the local, companion app for its cloud-hosted Microsoft PowerPoint Web app.