Nighthawk-
It's amazing to me that you make Apple out to be this great company and bash Microsoft. Apple's no better. Both companies employ extremely smart people and make good products. You think Apple makes superior products thanks to clever marketing. You've been brainwashed.
What's even more amazing is you're all about the 'underdog' Apple and have completely dismissed the Zune who's an underdog in itself. I can't wait when Zune 2.0 and flash Zune come out and begin rivaling Apple's share - which is far more likely than 15% Apple share of PCs.
Face it. Almost 100% of the business market is made up of Window's based systems (the most improtant segment of the market - forget about the Jones's home computer) and that's not going to go away anytime soon. And businesses would be far more ready to integrate Vista into their systems, than doing a huge overhall of hardware to Mac OS X.
While Mac's home computer sales are up and some figures say they're outselling PCs right now (again, due to their clever advertising) the world still runs on Windows. You're 15% is a dream.