From The Inquirer:

It would seam that Microsoft has decided that the word "Linux" is now "rude of offensive" under the latest volume of The Grand Microsoft 

Tome of Ethics.  In furtherance of this stance, a fatwah was issued, banning XBox users from using the word "Linux" in their online motto, as a member of Titan Onslaught Forums discovered.  Perhaps for some entertainment, the term "Vista" should be added to the forum swear filter?

Microsoft seam to be taking this whole anti penguin caper a bit seriously these days.

(AOAForums thread)