I own an IT consulting company, I am a Microsoft Partner & so is the compnay. I beta tested Windows 7 @ Microsoft's request so maybe my infomation is accurate...
It is my understanding (rightly or wrongly) that this offer no longer exists. It ran from a few months prior to the release of Win7 (Oct. 22, 2009, I think it was) to sometime in early 2010...end of January, if I recall correctly. It was for people who were buying new Vista machines just as 7 was released or about to be & was valid for a little while after its release. I'm quite sure this is now 'old news'.
Regards,
Drew