I just successfully installed with win 7 OEM. Conclusion, it support Win 7 but not win XP, since there is no version of Bootcamp that can generate Drivers for Win XP. I called Apple Tech Support many times, seems like they not really know well their products (anyway, this is current market. Many CSO dunno their own products not only Apple if you happen to call for phone support). Apple CSO even told me OEM version is not supported , only Retail version is supported. For me, they are the same, only packaging. I told them I already installed Win XP Pro OEM, only don't have drivers for the machine. He told is this is "strange", WTH. And now Windows 7 OEM is proven working. What can they say?