I have answered my own question
I don't know where to find my question - about having to enter Outlook account passwords every time I open Thunderbird, but I have solved the issue.
Tools - Account Settings - Server Settings - Security Settings - Authentication Method - CHANGED from OAuth2 to Normal Password
I had to enter a couple of passwords in Password Manager once. check Remember Password and everything is back to normal
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All your questions are shown in your profile https://support.mozilla.org/en-US/user/chattome/
BTW you have not "fixed" your issue, only deferred it for a time. Microsoft are in the process of refusing connections using Normal passwords. That is why automatic changes were made.
Thank you for both replies, Matt.
I posted this a couple of days ago in 'the wrong place'!
Does this mean when Microsoft don't allow normal passwords, every time I open Thunderbird I will have to enter the password for every mail I account I want to monitor in real time?
And will the Microsoft Oauth2 password be 'good' until I quit Thunderbird. That is to say I won't need to sign in after every 10 minutes Thunderbird checks for mail, and when I 'wake my PC up' after 'Sleep'?
Fortunately I only need frequent access to 4 or 5 of my accounts!