Microsoft is investigating a new report of limited “zero-day” attacks using a vulnerability in Microsoft Word 2000, Microsoft Word 2002, Microsoft Office Word 2003, Microsoft Word Viewer 2003, Microsoft Word 2004 for Mac, and Microsoft Word 2004 v. X for Mac, as well as Microsoft Works 2004, 2005, and 2006.
Recommendation: Do not open or save Word files that you receive from un-trusted or that are received unexpected from trusted sources. This vulnerability could be exploited when a user opens a file.
Well, that's just peachy. Time to fire up OpenOffice.
addition: 0959h 2006-12-06
Slashdot has a discussion on the MS Word vulnerability.