http://www.bit-tech.net/news/2007/01..._upgrade_discs

It seems you wiil not be able to do a clean install of VISTA with the upgrade vers of VISTA.


Microsoft now requires end users to have a genuine Windows installation before allowing an upgrade to Vista from inside the activated copy of Windows XP or Windows 2000

Just to clear.....

To reformat using the upgrade version of VISTA, you first have to install XP, activate it and then install VISTA.

This is definately going to to be a major PITA for many.

Now consider this: You want to build an all new VISTA/DX10 sys while keeping you present XP sys intact?

Ok, First you have to install XP and activate it on the new sys.
However you can't activate it because because it is all new hardware, So you can not install VISTA with the upgrade!
The ony way around this is to buy the full version.

There is going to be many angry people when they find this out!: