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⇱ Thunderbird 140 Mail Client Debuts As Newest ESR Release - Phoronix


👁 Phoronix

Thunderbird 140 Mail Client Debuts As Newest ESR Release

Written by Michael Larabel in Mozilla on 7 July 2025 at 04:22 PM EDT. 34 Comments
The Thunderbird mail client developers today formally announced Thunderbird 140 as the newest Extended Support Release (ESR) for this cross-platform alternative to Microsoft Outlook.

Thunderbird 140 is a big upgrade over the prior Thunderbird 128 ESR release. Thunderbird 140 now automatically adapts to using the dark message mode as part of the dark mode experience, new appearance settings, native OS notifications across Windows / Linux / macOS, easier account adding with the Thunderbird Account Hub, and manual folder sorting support. Thunderbird 140 also brings experimental support for Microsoft Exchange account setup.

👁 Thunderbird 140


Thunderbird 140 also adds an Export for Mobile option to generate a QR code for quickly transferring account settings and credentials to the Thunderbird for Android app. Thunderbird 140 also brings many other bug fixes and enhancements.

👁 Thunderbird 140 on Ubuntu Linux


Downloads and more details on the Thunderbird 140 release via Thunderbird.net.

Michael Larabel is the principal author of Phoronix.com 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 OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.