Can’t create calendar appointments after update 14.5.1

After doing the last update and needing to delete all of MS Office and reinstall from Time Machine after Outlook wouldn't work, I was a little hesitant to perform this latest "critical" update. But when I looked at the details, it said it was a fix to the last update, so I did it. Works much better but now I can't create new calendar appointments so I'm going to have to delete and reinstall again, unless someone quickly comes up with a solution. I can use my phone to create appointments but it is far slower and less convenient. I'm just about ready to give up on MS after 2 big errors in a row like this, and use the built-in Apple software. Sheesh--can anyone help?