I dont know what all the debating is about. Vista Enterprise runs just fine on my 3 yr old 2.2 AMD 3200+ with 1 GB RAM and a 128 MB Graphics Card. I have no bogginess or anything and actually like the Vista Enterprise. I havent tried the last MAC0sX but I do have 10.4?? (the one before this latest one) and can't really say it is any better than XP, actually I prefer XP Pro over it.