Using older versions of Outlook for Mac for personal email and calendar
Also: Launch Outlook, then click on the "Help" menu and select "Revert to Legacy Outlook".
I am going to have to do this again soon. Another absolutely maddening thing the Microsoft "I know best" Nanny is doing: My Outlook has a message at the top "The new Outlook for Mac is here! The new version will launch the next time Outlook restarts". Like I am supposed to wet myself with excitement. I can find NO way to disable this forced "upgrade".