The OEM terms tie the license to the motherboard. You are specifically allowed to replace the motherboard for reasons of repair with a like unit, and reactivation won't be an issue.

Windows is Not Apple Quicktime or Itunes.   The licence is for one machine only.  There is no deauthorization of licence and re authorization.  No such thing exists for WINDOWS licences.:emotion-3:

What you are asking for does not exist.

Windows is a microsoft product and activation.

Additional Information About Microsoft Warranties and License Agreements

Genuine Microsoft Software

I know that. Isn't that why every time you install your OEM pack 8.1/8/7 into a new computer you have to call microsoft to get your old computer deauthorized and the new one authorized.

Can I call Dell and get them to de-authorize my WIn 7 licence on my old motherboard?

If it's an identical replacement Dell motherboard (eg, same chipset, same onboard video and same NIC), and you're reusing the original CPU, will you need to reinstall Windows?

Windows that's already installed on the hard drive may not complain, as long as there's a Dell version BIOS on the new, identical board. I'd give that a try before reinstalling the OS after you swap boards.

If you're attempted to use a non-Dell motherboard, you will need to purchase a new Windows license, and you can't use Dell's OEM Windows with the new motherboard because it will only install if it sees Dell version BIOS.

Isn't that why every time you install your OEM pack 8.1/8/7 into a new computer you have to call microsoft to get your old computer deauthorized and the new one authorized.

Dell doesn't handle that; Microsoft does.

I see. 

THanks for the responses, does anyone know anything about the 8.1 Pro for Students? Does any K-12 student qualify?