I have a MBA, and have decided that I want to have Windows on it as well, since although I hate Windows and love OSX I use quite a lot of Windows only s/w, and I only want to carry one computer. Couple of questions though: How big a partition does Windows really need (I have 128GB SSD, about 80GB free right now)? If I get a new MBP a few months down the line, how easy is it to move the copy of Windows to that? And do they honestly expect me to pay £250 a time to install Windows on two laptops if I decide to keep the old one, even though they are both for me and would never be used at the same time? This is an honest question, I don't want to cheat anyone, but I'm not exactly made of money, and the price of the Windows os scares me!