I did most basic trouble shooting when working with someone experiencing this issue such as setting Outlook as the full default program, restarting the PC, but overall what seemed to fix all the outlook issues that were occurring was a a simple Office Repair. This is done in the control panel, programs and features, find Microsoft Office Suite, select it, hit change at the top, click repair, and do a quick repair. This should fix all issues.
I had unsuccessfully tried to install a newer version of Microsoft Office and got the error when trying to revert back to the original version. This did the trick, thank you!!!