I just bought the Vista Home Premium upgrade to install my mac pro via Boot Camp. It was $69 shipped (academicsuperstore.com). I have a legit old copy of Windows to upgrade from, but you don't even need one. It turns out that if you install the Vista upgrade alone without activating, and then reinstall the upgrade over it and then activate, it works (thinks it's upgrading). How silly is that? I'm not encouraging that somewhat shady practice, and I think most people have an old but legit copy of Windows hanging around somewhere. I think $69 for an OS that only comes around once every 5 years or so is a damn good price, and the Home Premium version doesn't seem too stripped. As for the non-academic prices, they are too high IMO. At least there's always the option of going with an OEM version from Newegg, etc.