Thunderbird 91 Released With Big Improvements For This Open-Source Mail Client

Written by Michael Larabel in Mozilla on 11 August 2021 at 08:06 PM EDT. 49 Comments
Thunderbird 91 is now available as the first major update in a year for this Mozilla mail client that is succeeding the Thunderbird 78 series.

Thunderbird 91 is finally set to offer import/export support for Thunderbird profiles, various user-interface improvements, improved GMail account integration, improved calendar settings, and tons of bug fixes and smaller improvements. The user-interface work includes enhancing the message reading UI, the message compose window has also been revamped, calendar UI improvements, and more.

For helping the performance, Thunderbird also now operates in the Gecko e10s multi-process mode by default. On macOS is also now native support for Apple Silicon / M1 CPUs, the PDF.js PDF viewer is now included as part of Thunderbird, CardDAV address book support, and much more.

See the release notes for the full list of prominent changes to find with this upgraded open-source mail client. Thunderbird 91.0 can be downloaded from
Related News
About The Author
Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

Popular News This Week