[WraGG]

http://www.microsoft.com/oem/en/lice...id=HTVj4t2PMIq

Thanks to downgrade rights, end users who have acquired a more recent version of the software (such as Windows 8 Pro or Windows Server 2012 Standard) can use a prior version of the software (such as Windows 7 Professional or Windows Server 2008 R2 Standard) until they are ready to move to the more recent version. If a product includes downgrade rights, the license terms for that product will indicate which prior versions of the software may be used.

Nemam iskustva sa downgrade-om W7 na XP, ali kad je W8 downgradean na W7, upgrade na W8 radi sigurno. Prosli tjedan sam imao dva takva slucaja i sa recovery diskovima je sve proslo bez problema.