Upgrading existing Windows 7 Pro licenses to Ent?

Solution 1:

I doubt they are trying to rip you off, Professional can only be upgraded to Ultimate (you can not go from Ultimate to Enterprise either, but why would you want to?). But you will need to ask them about using the same product code.

The enterprise paths and the retail paths do not cross each other in Windows 7.

From Windows 7     Anytime Upgrade to Windows 7

Home Basic         Home Premium, Professional, Ultimate

Home Premium       Professional, Ultimate

Professional       Ultimate

Starter            Home Premium, Professional, Ultimate

If you had Vista Business you could go from Business to Professional, Enterprise, or Ultimate but once you are on 7 you are stuck on whatever branch you started on.

From Windows Vista (SP1, SP2)  Upgrade to Windows 7

Business                       Professional, Enterprise, Ultimate

Enterprise                     Enterprise

Home Basic                     Home Basic, Home Premium, Ultimate

Home Premium                   Home Premium, Ultimate

Ultimate                       Ultimate

UPDATE: After checking the internet and seeing a strangely familiar question on another site, You can not do a in-place upgrade from pro->ent however it does qualify if you want to get the cheaper upgrade licenses than buying them new. But it will require a re-install of windows.