I read that a subscription to technet.microsoft.com includes 10 product keys for Windows 7 Ultimate as well as other OS versions. Can anyone confirm this? I'm considering buying a subscription solely for the product keys. I have several PCs running Windows 7 at home/office and would like to make them legit. The subscription price is $251 which isn't bad if it actually includes 10 keys. Are there any other sources for legitimate keys?