Thunderbird Desktop
Version 140.2.0esr | Released August 19, 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
What’s Fixed
fixed
Users were unable to use Fastmail calendars due to missing OAuth settings
fixed
Account setup error handling was broken for Account hub
fixed
Menu bar was hidden after updating from 128esr to 140esr
