IIRC, though, OEM versions are tied to the motherboard they're installed on, with hardware or without. So if you get another computer (or build one, more likely) and you need an OS, you can't use the OEM version you originally bought. I'm not sure if this is actually enforced in the software or if it's just a legal technicality, though.
The article seems to have been deleted -- everything else works, except it can't find that article. Google Cache works, though. http://209.85.173.104/search?q=cache:cZIWXV4A-GIJ:blogs.technet.com/jeffa36/archive/2007/12/13/microsoft-com-what-s-the-story.aspx+http://blogs.technet.com/jeffa36/archive/2007/12/13/microsoft-com-what-s-the-story.aspx&hl=en&ct=clnk&cd=1&gl=nz&client=firefox-a
Btw: Siverlight -> Silverlight.
IIRC, though, OEM versions are tied to the motherboard they're installed on, with hardware or without. So if you get another computer (or build one, more likely) and you need an OS, you can't use the OEM version you originally bought. I'm not sure if this is actually enforced in the software or if it's just a legal technicality, though.