Thunderbird Desktop Version 140.5.0esr | Released November 12, 2025

Thunderbird Desktop

Version 140.5.0esr | Released November 12, 2025

Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla.

For help and a quick start on Thunderbird 140, see Thunderbird 140 Eclipse FAQ

For more on all the new features in Thunderbird 140, see What’s New in Thunderbird 140.

System Requirements: Details

• Windows: Windows 10 or later

• Mac: macOS 10.15 or later

• Linux: GTK+ 3.14 or higher

Release Notes

Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features!

www.thunderbird.net