Microsoft has the following offer - if you will now purchase a qualifying version (either full or upgrade) of Windows Vista from the company's store, then when Windows 7 becomes available you will get the equivalent edition of the newest OS for free.
Buy, download Windows Vista software from Microsoft Store
I suppose that if you are not a student or have missed pre-order discounts, then this is a pretty good deal. Or at least is so in my opinion, as I always can think of a way where/how to use a spare OS![]()