To get the old Outlook back on a PC at least, open the run dialog by pressing the Windows and R keys. Type Outlook.exe. Press enter.
Agree that this new Outlook is a disaster I'm using the Outlook 2019 PC version through Verizon as a POP account relayed through AOL. The new Outlook is not yet usable with a POP account. You can't log in, it doesn't recognize your account, and it helpfully offers to send an authorization code to your email that you can't log in to and it can't send to.
Fantastic reply, so simple. I panicked, thought I'd lost all of my mail accounts.
Why can MS not have answered this?!?!?! As usual, MS, Goggle ( :-) ) Thinking for us!! Bunch of chocolate tea pots!!