Change Microsoft Office 2007 License Key

Follow these steps:

1. Close all Microsoft Office applications.

2. Click Start, click Run, type regedit in the Open box, and then click OK.

3. Locate the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\12.0\Registration

Note You may also find another subkey that resembles the following subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\12.0\Registration\{91120000-0011-0000-0000-0000000FF1CE}

4. If you find additional subkeys that reference Microsoft 12.0 registration, open each subkey, and then identify the product by the ProductName entry.
For example: ProductName=Microsoft Office Professional Plus 2007

5. When you find the subkey for the product from which you want to remove the existing product license key, delete the following entries:
* DigitalProductID
* ProductID

6. Exit Registry Editor.

The next time that you try to run an Office application, you will be prompted for a new product license key. Then, you can enter the product license key.That's it.