no, and thank the gods I never will.
Microsoft is like the ssb of the computing world. Vista has tanked in the individual home/office user space, with most opting to continue to run XP; now 7 years old. I gave away my 1 windows machine, now that Intel Macs run windows better than most garden variety whitebox machines, there was no reason to keep it.
My 2003 Dual 1.8Ghz PPC G5 keeps on truckin, if I'm still around by the time apple pulls op system support for it, I'll get a Mac Pro.... by then they'll probably be at 16 cores per CPU, with a operating system that knows what to do with them all.
http://www.apple.com/macosx/snowleopard/K. Apple fanboy-ism over.