I get spam from unsavory sites on an almost hourly basis now that my “Vista Business is ready to download” or that I can buy Vista Business for $79. Like the bank information change request, paypal account verifications and eBay login inquiries these should be ignored. In fact, no spam should ever be clicked on—if you do see something of interest like a fake watch or drugs, type it into Google and follow up that way. If nobody ever clicked on this stuff, they wouldn’t do it, but based on the volume of spam out there, people must be falling for this stuff on a large enough scale that they find it worth doing. The sad thing is it only takes one or two out of a million before it is worth the trouble because it is no more effort for them to spam a million people than it would be a dozen. But back to the Vista thing...

NewEgg.com actually sells OEM versions for $94.99 (home basic) to $119.99 for home Premium, $149.99 for business and only $199.99 for ultimate. That is quite a bit less than the retail prices that go up to almost $400.

If you dig for it, there is an OEM warning that reads:

This OEM software is intended for system builders only and cannot be transferred to another PC once it is installed. The purchaser of this software is required to comply with the terms of the System Builder license, including the responsibility of providing all end user support for the software.

The full license details:
http://oem.microsoft.com/downloads/Public/sblicense/English_SB_License.pdf