: If an Office 2007 installation is not activated within 25 launches, the suite enters a "Reduced Functionality" state. This locks features, disables document editing, and turns programs like Word and Excel into read-only viewers.
Office 2007 retail keys have strict activation limits. Most keys posted publicly on GitHub have already exceeded their activation threshold and will trigger an "invalid key" or "maximum activations reached" error.
Technology moves forward for a reason. The reason you cannot easily find a "new" Office 2007 product key on GitHub is that the software industry has shifted to subscription models, cloud security, and continuous updates.
: If installed, you can find the Product ID by clicking the Office Button > Word/Excel Options > Resources > About .