Install LibreOffice. It is free, safe, and reads/writes Microsoft files better than Office 2011 ever did on Lion. Your old Mac deserves software that is secure—not abandoned.
Microsoft Office for Mac OS X 10.7.5: Compatibility and Download Guide
: This is the last version of the Office suite that officially supports OS X 10.7.5 . It requires an Intel Mac running Mac OS X 10.5.8 or later.
: This was the primary suite designed for this era of macOS. It includes Word, Excel, PowerPoint, and Outlook. Office 2008
Comparing to Microsoft ( Microsoft Corporation ) Outlook designed for Windows OS by default, the Outlook ( Microsoft Outlook ) for... Microsoft Outlook Microsoft Teams