Using Classic Outlook on Windows for personal email, calendar, and contact management
Just want to say that this reply worked and kept me sane. It should be pinned as "the" solution. I recently had to go back in and make changes to the ribbon as MS Outlook updated and the "Collaborate" tab re-appeared and once again made reference to this solution. FYI - I'm on a company computer with restricted admin rights and still had access to these files and making them read only. Thanks again.