Here are normal settings for Hotmail: - incoming: outlook.office365.com, port 993, SSL/TLS, Oauth2 (assuming IMAP) - outgoing: smtp.office365.com, port 587, STARTTLS, Oauth2

I thank you for your effort David. Unfortunately, I am not technically proficient enough to understand what your instruction means or enact any change based on your information. I tried fishing around in Tools earlier, as someone else said go to Account Settings in Tools, select outgoing server (SMTP). So I got that far and saw nowhere "from the bottom of the list in the left panel do something or other. I failed.

I will not be able to do it without explicit direction. I never had any formal computer instruction. Where I worked we had a help desk. They didn't want us messing with settings. All I was ever formally taught was how to do email. I learned a whole lot when I had to during the pandemic, but it is not sufficient. Before the most recent Thunderbird update I always could send to Yahoo and Hotmail just fine. Something must have changed. I wish it would just change back.