There is no legitimate "100% working link" for a free Microsoft Office 2007 product key. Office 2007 is no longer supported by Microsoft, and any website claiming to offer free, universally working product keys is almost certainly offering:
It is no longer possible to provide a "100% working" product key or a direct download link for , as Microsoft officially ended all support and distribution for this version in October 2017 [2, 3]. microsoft office 2007 product key 100 working link
There are no more security updates. Using it today leaves your computer exposed to modern exploits that target old Office file formats. Compatibility Issues: There is no legitimate "100% working link" for