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Take a backup of "Registration" key before deleting the registry entries from right-side pane, so that in case the new product key doesnt work you can restore the previous key without any problem. One GUID key will contain the version number of Office installed in your system "Microsoft Office Professional Edition 2007".Ī. Select each key and look at "ProductName" key in right-side pane. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\12.0\Registrationģ. "Microsoft Office Professional Edition 2003". One GUID key will contain the version number of Office installed in your system e.g.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0\Registrationģ. Enter the desired product key and click on OK.

It should prompt you to enter a new product key.Ħ. Close registry editor and run any Office application e.g. Select that GUID key and delete following 2 registry entries from right-side pane:ĥ. One GUID key will contain the version number of Office installed in your system "Microsoft Office XP Professional Edition".Ĥ. Under "Registration" key, you'll see one or more GUID (Globally Unique IDentifiers) containing a combination of alphanumeric characters in following format:ģ.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\10.0\RegistrationĢ. To change the product key you'll have to uninstall the Office suite from your system and then reinstall it.īut here is a small and simple tutorial which will help you in changing the product key without uninstalling the Office. It might be because your product key expired and you got a new one or it might be because you installed Office using pirated key and now you want to change the product key with a genuine one. Many times you might want to change the product key of Office suite installed in your system.