Look for a Certificate of Authenticity label, usually on the computer itself for OEM versions (pre-installed).
If Office 2007 came with your computer, the activation should theoretically be seamless, but old hardware changes can trigger the activation prompt. Troubleshooting Activation Issues Microsoft Office 2007 Activation Wizard Confirmation Code
If you are having trouble, let me know you see on your screen so I can provide the exact steps to fix it. Share public link Look for a Certificate of Authenticity label, usually
: Call the number provided. The automated system will ask for your Installation ID Share public link : Call the number provided
When a user installed Microsoft Office 2007, the Activation Wizard would launch. This tool generated a unique based on the product key and the user’s hardware fingerprint. To complete activation, the user had to provide that IID to Microsoft (via internet or phone) and receive back a Confirmation Code —a 42- to 50-digit alphanumeric string. Entering this code unlocked the software permanently on that machine. The confirmation code was the final key that transformed an installed trial into a fully licensed copy.