How to change Microsoft Office product key

How to change Microsoft Office product key

Problem: Need to change Office Product key without uninstalling and reinstalling Office.

Quick Solution:

1. Backup the registry.

2. Locate and then click the following subkey, depending on your version of Windows and of Office:

32-bit versions of Office
2007 HKEY_LOCAL_MACHINE \Software\Microsoft\Office\12.0\Registration

2003 HKEY_LOCAL_MACHINE \Software\Microsoft\Office\11.0\Registration

2002 HKEY_LOCAL_MACHINE \Software\Microsoft\Office\10.0\Registration

64-bit versions of Office
2007 HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\12.0\RegistrationOffice

2003 HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\11.0\RegistrationOffice

2002 HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\10.0\Registration

3. Delete the following two registry keys.
a. Right-click the DigitalProductID registry entry, click Delete, and then click Yes.
b. Right-click the ProductID registry entry, click Delete, and then click Yes

Close registy editor and open office product. It will prompt to activate and request the new license key.

Source: http://support.microsoft.com/kb/895456