Velocity Technical Archive
How to change the product ID in Office 2007 64 bit
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Open registry editor.\nBrowse to HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftOffice12.0Registration\nUnder this there is a subkey that is a long GUID. Click on that and find the following keys.\nDigitalProductID & ProductID\nDelete them both.\nOnce these are deleted open any Office application and it will prompt you for a new key.