com.microsoft.office.licensing.plist is a system-level preference file used by Microsoft Office for Mac 2011 to store encrypted activation and product key information. File Location and Purpose /Library/Preferences/com.microsoft.office.licensing.plist

/Library/Preferences/com.microsoft.office.licensing.plist

The distinction between these two locations is vital. A user-level license travels with the user account, while a system-level license (often deployed via scripts or management tools) allows any user on that specific Mac to utilize the Office suite.