I will quote the most important text though here: "Run any OS at the Same Time as Mac OS X
Use any version of Windows (3.1, 3.11, 95, 98, Me, 2000, NT, XP, 2003), any Linux distribution, FreeBSD, Solaris, OS/2, eComStation, or MS-DOS in secure virtual machines running alongside not instead of - Mac OS X."
I'm not sure why you would want to run the worst operating system every made by Microsoft though!?