Not a question, a suggestion. On the help page for using OAuth2 in Thunderbird, there are 2 things not specified. 1. In the SMTP settings, I couldn't select OAuth2 untli I changed the server from something older to, if I remember right, smtp.office365.com. The old entry was more like smtp.outlook.com. Then I had to close and restart Thunderbird. 2. Tbird still couldn't access my Outlook mail account. On Microsoft's security page, I had to create an "app password" and enter that in Thunderbird instead of my previous Outlook password. Either I made an error, or the first app password didn't work and I had to create another app password; that time it succeeded.