I came across this link that talks about a case if Microsoft comes up with a strategy of running Linux on Windows.

The goal : provide advantages of both the OSes (kill Linux).

But I guess, numerous possibilities, like these, could be considered. And definitely heads at Microsoft are at it as well.

updated (28th Feb, 2005) : And here is a riposte to the article.
updated (28th Feb, 2005) : Rebounds on John Dvorak's article all over the place.