A new version of the open source Thunderbird email client is now available. Thunderbird 91.4.1 is a security update for the e-mail client that also contains a good dozen nonsecurity fixes and improvements.

The official release date was December 17, 2021, but the new version was not offered on a fully patched system on December 19, 2021.

You can check the installed version by selecting Help> About Thunderbird from the menu. If you don’t see the menu, tap the Alt key to bring it up. Thunderbird manually checks for updates and installs new versions if available.

The official download site lists Thunderbird 91.4.0 as the last version, and the only source for the new version at the time of writing is the classic FTP site.

Thunderbird 91.4.1

The security fixes have not yet been released on the official Security Advisories for Thunderbird website. You may want to check there later to see if the information has been released.

The release notes are available and you can …

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