First instead of using the word Apple you should have used "Mac" then people would be less incline to be asking questions as to what you meant.
Second: As a Mac user (see specs) I use both the Mac OS 10.6.4 (snowleopard) and Windows Vista (boot camped on the Mac). I have a separate Windows 7 machine that I run Windows 7 and XP sp3 in a VM.
By doing it this way I have all the bases covered. . .