Virtual PC is not the same thing as dual booting XP and mac OS. Virtual PC is an emulator. it uses software to create a virtual x86 machine and runs windows in that. As BB-gsm said it's very slow, it's like having windows xp installed on a pentium II, but it's an alternative solution to allow you using "windows programs".
And about Mac OS X v10.5 "Leopard" Apple intended this release at the end of 2006 or early 2007.( piano !!!)
BR. |