Quote: Originally Posted by bobkn
I was aware of the trick of running the upgrade from a demo version of Vista. (I've done it myself, as a convenience.)
It's not much of a time saver over installing the old OS, and then launching a clean install using the upgrade license. It permits installing Vista on a blank HD with an upgrade license without having a qualifying older OS. That would be a violation of the license agreement, I believe.
What this does allow is to upgrade a qualifying OS without an available qualifying install medium
, (a situation which can arise with machines that are supplied with pre-installed with an OEM OS). The other potential problem with the use of a qualifying medium is how the upgrade mechanism regards an upgrade DVD as qualifying medium, is it possible to use the Vista upgrade DVD for installing windows 7 or do you have to provide a full
As you rightly say the use of the double install method, without a qualifying OS llicence would be a breach of the licence terms. I personally believe that the use of a qualifying licence key would be a better upgrade mechanism as this could be checked as genuine.
The chosen system is open to abuse as I understand that any qualifying DVD can be used to install windows 7 so one
DVD could be used to install more than one upgrade licence, again an abuse of the system.
Why MS choose to allow these loopholes will always be a mystery to me
The advantage of the double install method over installing the original OS, (XP or Vista), is that there is no detritus from the original OS left on the system