Still Billy doesn't admits that he has stolen the whole Vista looks from the Mac when he was on a interview by CNN. This question really says it all "Were you going after a specific look there, the Mac look?" 

 The response: "No, no, no… We're ahead on a lot… There's whole areas where we've innovated like Media Center and tablet…"

 What the "Vista evolved from the Media Center"! Billy i never knew you nowadays copy from your own products!