Just before I went on holiday, I rebuilt my company-supplied notebook PC to run Windows Vista (running Linux doesn’t look too good when you work in the Microsoft Practice of a major IT company). At the time, I didn’t have any volume license media and whilst I knew that all of the retail editions were contained in a single image on the retail DVD, that doesn’t include Windows Vista Enterprise Edition. Nevertheless, I installed Windows Vista Business Edition, choosing not to supply a product key (Vista allows 30 days before activation is required). Since then, a colleague has sent me the correct media and license keys, so tonight I was ready to rebuild on Windows Vista Enterprise Edition.
I say rebuild because I didn’t expect an in-place upgrade to work but it did – “upgrading” my Windows Vista installation to a new edition was as simple as dropping in the CD and running the installer. It seemed to take a lot longer than a fresh install (understandably) but I still have my user accounts, profile and data from prior to the upgrade. So, just to confirm, it is possible to upgrade from a retail to a volume license (enterprise) edition of Windows Vista.