It's incredible what people call poor support here in this forum. If I go to the Apple store and need help, it's $100 just to speak to someone personally for an hour. Also it's $75 an hour to talk to the Geek Squad at Best Buy, Or FireDog at Circuit City.
Apple can claim all the the sales they want, but how many people are buying Apple hardware and running some form of Windows through BootCamp or Parallels Desktop.
Realize Apple is going after the consumer market, this doesn't talk about what's happened with Vista in the Enterprise, or even Windows 2008 server or Home Server which haven't even showed up on the radar yet, and Apple likes to talk P.R. I doubt Microsoft (a personal opinion) is even talking numbers at this time of the year.
Also, one of the interesting things on the leopard disc is bootcamp drivers for 32 bit XP and Vista for all of the Mac's Intel hardware as it's feature. That would make Apple the number one "PC compatible" if their numbers are true..
It's a little bit like comparing Apples to Oranges so to speak. Microsoft makes software, and accessories. They aren't the PC hardware maker, there are several of them. Apple sells hardware..