Two installs. One for a 2.8 MBP (current model) and one for a Early 2008 2.8 Mac Pro Octo. I own VMWare and Parallels, both in the previous versions but can easily upgrade the licences. Not sure which is better at this point. I don't see any reason that I should need boot camp. Now the real problems... What are key differences between the Windows 7 versions and what do you recommend? The Microsoft charts are pretty confusing Is 64-bit worthwhile? What about OEM versions? Will they work? Can they be upgraded later if a new version of Windows comes out? Ethics aside, if I want to run one version of Windows temporarily on 2 machines while I evaluate if I like the version selected, will there be any obstacles to installing one version on two machines apart from the EULA? Anything else to consider? I should add that I am not a gamer, and use XP primarily for playing backgammon online, analyzing those matches, and running a large homeopathic software program (none of which is 64-bit as I understand it). Thanks for your help!