After upgrading my Mac to 11.2.3 today, Office 365 apps Excel, Powerpoint, and OneNote are broken - they only show a Microsoft Error Reporting window, then they close. Outlook lost my account, which was easy to relogin and add my email address. Word was fine. I am still figuring out how to recover, but I thought I would post in case others are having problems. Btw I am on Office Insiders Beta Channel...