From a licensing perspective, it's legitimate. Some people have reported
trouble, typically with retail editions.

Paul Thurrott provides excellent guidance through the issues that folks have
encountered.

http://www.winsupersite.com/win7/clean_install_upgrade_media.asp

He also weighs in on the clean install vs. in-place upgrade topic:
http://www.winsupersite.com/win7/win7_upgrade.asp


--Geoff

> -----Original Message-----
> From: Technology Discussion at UVM [mailto:[log in to unmask]] On
> Behalf Of Alison Pechenick
> Sent: Wednesday, February 03, 2010 1:30 PM
> To: [log in to unmask]
> Subject: Re: Upgrading to W7 (was: Windows 7 Pro vs Enterprise)
>
> Not sure if this observation fits your remarks here, but please note
> that if, for some reason, a machine presently has Vista Home, you
> can't upgrade to 7 Enterprise.  Upgrade has to match existing edition.
>
> Thanks,
>
> Alison
>
> Quoting Geoffrey Duke <[log in to unmask]>:
>
>
> >
> >
> > * A system must have some version of Windows purchased with it. Our
> Campus
> > Agreement covers upgrades to existing Windows OS. Buying a system
> with Linux
> > disqualifies that system, and you need to buy a Full (i.e., non-
> upgrade)
> > Windows license for the computer, preferably through the Microsoft
> Select
> > program via the Computer Depot.
> >
> >