You can find official guidance on the Microsoft Support page for activating via internet or phone. Option 2: The "Why to Upgrade" Post
Microsoft officially ended all support for Microsoft Office 2007 on October 10, 2017. This means the company no longer issues new product keys, updates, or security patches for the suite. microsoft office 2007 product key 100 working link
The Hunt for a Microsoft Office 2007 Product Key: Safety, Legitimacy, and Modern Alternatives You can find official guidance on the Microsoft
Even if you find a key that seems to work temporarily, it violates Microsoft’s software license terms. Activation servers may still flag it, leading to a non-genuine notification. The Hunt for a Microsoft Office 2007 Product
This key proves that you have a licensed copy of the software and unlocks the full functionality of programs like Word, Excel, PowerPoint, and Outlook. Where to Find Your Official Office 2007 Key
If you have concrete proof of purchase, Microsoft may be able to provide a replacement product key. However, because Office 2007 is no longer supported, this option is increasingly limited.