Windows 10. Thunderbird 115.7.0 32-bit. Email address is at hotmail.com, so it's an old account that's now at outlook.com This is a personal email account not related to any business nor to Office 365 or anything like that. I have had the account for decades. Thunderbird quit working with my hotmail account this morning. It goes into an Invalid Password Loop, even when I respond with the correct password. I can logon to my hotmail account just fine with a browser. It's just not the same positive user experience as using Thunderbird. I'm sure the problem must have to do with OAUTH2. The outgoing SMTP server is outlook.com Server name is imap-mail.outlook.com Port is 993 Connection security is SSL/TLS Authentication method is Normal Password Changing Authentication method to OAuth2 does not solve the problem. Instead I get a popup error message that's very hard to capture that is to the effect that "The imap server imap-mail.outlook.com does not support the selected authentication message". It's like I need to use a different imap server. I found one site that said to use outlook.office365.com but I don't really use office365. I may give that a try anyway. I don't see any other account settings that seem relevant