Back in September, 2024, Microsoft Outlook no longer accepted my long-used login information via Thunderbird. I could still log in to ''https://outlook.live.com/owa/?realm=hotmail.com'' from the Firefox browser. I tried adjusting Account Settings (e.g. Server Name, Server Type [POP], Security/Authentication, etc. to no avail. I downloaded the current version of Thunderbird (128?) and tried installing per directions found here. Tried using the Flatpak path. The direct Command Line path yielded the same result. ''dave@Sequimer:~$ sudo flatpak install flathub org.mozilla.Thunderbird [sudo] password for dave: Skipping: org.mozilla.Thunderbird/x86_64/stable is already installed'' On edit: Did what I hoping to avoid and deleted Thunderbird and all of the Thunderbird related files in the Linux home directory. Then installed a current version of Thunderbird and imported email stuff from an earlier backup. It works but now I have two renditions of Thunderbird running simultaneously.