Having had to use a PC for most of my working career, and prefering the User Interface of the Mac, I have been torn for years. Until Apple release their operating system Tiger (10.4), Windows and Mac OS were on similar terms (TO ME) as far as usefullness, but windows always had more programs available. But since 10.4, it is baffling to me that there is even an argument against the Mac platform for personal or graphic use.
Windows has a solid business platform, but with the security and ergonomic UI that mac offers, much less the value of the software that is bundled with the machines and the cult-like support system that comes with buying a Mac, I thing the tides may collide stronger than Gates may want.