How to change product key on Office 2003

April 9, 2008 by Tayla Dodson

Regedit

Find

HKLM/Software/Microsoft/Office/11.0/Registration/<only-32-bit-ID>

-Change the value of key “ProductID” to “OldProductID”
-Delete the key DigitalProductId

Now start one of the office apps – it should ask you to re-enter the key, then activate normally.