"R. C. White" écrivait
ecom:

There are "upgrade" and "full" retail packages. The actual bits on the
DVDs
are the same, but the "upgrade" retail package is less expensive because
its
Setup.exe checks for a qualifying version of Windows already installed
and
activated on the computer before continuing with the installation.

I don't think it checks for activation because if you use the "upgrade over
itself" method on empty hard disk with upgrade DVD, you don't enter key,
don't get updates and don't activate the first installation, you do so when
you "upgrade" it with itself and the first installation will qualify even
if not activated.