Microsoft Office has "extremely critical" hole

The bug applies to Office 2000, Office 2003, Office 2004 for Mac and also to the Microsoft Works Suite.

"An unspecified error" in the handling of Word docs can be exploited to cause memory corruption.

The fix is not to open or to save "untrusted" Word documents says the warning, here.

That would mean you probably have to be careful when you're browing the Interweb and find documents lying around there, we guess. Sheesh and kebabbed. µ