[Aurel]

DD74,

You can buy a licensed copy of windows XP from Microsoft, and install it on any machine you want, either a PC that you build yourself, a Mac, or whatever else can run it. So, for Microsoft, it is legal.
Now, for Apple, obviously they endorse it, they know it will raise their sales of Macs, and they are the ones who explain how to do it.

Now, running Mac OS in PC should be doable too, but I think Apple has made sure it will be much more difficult, the reason why they use the EFI system for booting. Obviously, Apple does not want his OS running on PC s that they don`t sell, while they welcome windows on their machines if that can incrase their market share.

Porsche had to make SUVs, Apple had to run XP. In both cases, it upsets the purists but helps the company stay around.

Aurel