I'm a Microsoft Partner, Microsoft beta tester, Microsoft OEM System Builder and authorized Microsoft reseller.. It's my job to know the EULA and abide by it. I run into Microsoft licensing issues daily as part of my job...and I'm telling you, OEM software is a totally different ballgame than the retail box version.
You're not allowed to even sell an OEM copy to someone without accompanying hardware that is essential for the operation of the computer. Support for the OS falls on the computer vendor, and that's why we buy it much cheaper than you can in Worst Buy.. and under NO circumstances is it transferrable to another computer, period.