I think mahesh2k nailed it. What desktop? It's 2012 and it is now the place at which I spend the least computing time. My [mobile] "devices" are all running Linux in some form, as is my latest i7 desktop build. Fortunately, my computing life became an internet life years ago. The desktop is incidental to my needs, especially with regard to work and travel. Get me to a browser and I can access and share everything I need/want on company servers and, more personally, on my google account/s.
Point is, someone explain why I would need Windows or OSX?