Using older versions of Outlook for Mac in business environments
Hi Tristan,
May I know how did you installed Outlook for Mac using Office 365 portal or else?
Please provide us with the detailed screenshot about the Office version, Open any Office application, such as Word and create a new document. For example, go to Word and choose About Word. see About Office: What version of Office am I using?
Are you using Time Machine for backup?
If so, you can use that backup to restore to see whether you can recover the Outlook.
Your patience and understanding are highly appreciated. Have a nice day and stay safe!
Best regards,
Shyamal