CONC: Apples and Oranges

Windows Vista delayed
There was once a time when the Mac OS and Windows were direct competitors; two creatures fighting for survival in the
same niche. But that was around 1992.

Mac OS and Windows have since evolved into two distinct animals. One is a cat and the other is a dog (no derogatory connotations intended). Windows has long tended to the needs of IT and the business user while Mac OS X's strengths lie in home computing and media management. The characteristics of both creatures overlap, but they have different strengths and weaknesses and will continue to coexist for a long time. Now if you're saying that the cat will become man's best friend...
That's a different debate ;-)