I have a separate but related problem
Until this Outlook 2016 problem started, I was successfully holding both outlook.com and gmail mail accounts in my local Outlook 2021 system on Windows 11. at the same time as the Outlook 2016 problem started, the system told me to renter my outlook.com account details, but it would not accept the login details (which were correct). I therefore deleted the outlook.com account from my local Outlook 2021 system, but now when I add it back again, the login details are accepted, but I cannot access any email or calendars on either my outlook.com account or my Gmail accounts. I get the error 0x80040111 and the message " The server is unavailable"
As soon as I delete the outlook.com account, everything starts to work again.
Has anyone else seen this problem?