Outlook calendar on mac not showing up

Amanda_Val  after a few hours of wailing & gnashing of teeth (as well as finding whatever threads of information that I could on Google), the silver bullet which ended my problems was installing Outlook 16.66 to replace 16.63. Presto, all calendars returned! I suspect that the culprit was a brief flirtation last week with "new" Outlook which turned sour when "new (but not improved)" Outlook wiped all four of my email signatures, prompting a return to "old but more dependable" Outlook.