According to an article on the Daily Finance web site, Microsoft is indoctrinating Best Buy employees to sell Windows 7 by telling outright lies about Linux. No surprises there, it’s not the first time they’ve resorted to telling lies about their competitors.
It does show a measure of desperation. As one of the comments in the Blog of Helios article pointed out, you generally want to avoid mentioning your competition in your own advertising. By putting up a defense against Linux, Microsoft is making it clear that they are worried. And the fact that they resorted to lies shows how weak there own position is.