Using older versions of Outlook for Mac in business environments
Found a solution that worked for me.
Click the OUTLOOK menu in the upper left corner of your screen (next to the apple) > click on where it says (NEW OUTLOOK) in the list with the check next to it. This will switch the interface back to the traditional, classic look of Outlook. You'll need to re-add your email account (???? smh) but after setup magically the options are no longer greyed out. A really simple fix that is completely non-intuitive for the user. Ridiculous. There's no less than a dozen posts about this issue and no solutions. Seriously, come on Microsoft. Do better.