Thunderbird Desktop
Version 91.0.3 | Released August 26, 2021
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.
** Thunderbird 91 is only offered as direct download from thunderbird.net and not as an upgrade from Thunderbird version 78 or earlier.** A future release will provide updates from earlier versions.
System Requirements: Details
- Windows: Windows 7 or later
- macOS: macOS 10.12 or later (macOS 11.0 for Silicon)
- Linux: GTK+ 3.14 or higher
What’s Fixed
fixed
Folder icons could be overridden by linked favicons in HTML messages
fixed
Unified folders showed no messages when underlying folders were removed
fixed
Folder pane toolbar did not always persist after restarting Thunderbird
fixed
Compose window attachment pane did not close when disabling signing of an OpenPGP message
fixed
Using "Reply to List" with some list emails incorrectly opened a "no-reply" warning
fixed
Unread message count badge on Windows tray icon did not update after moving messages to the Junk folder
fixed
Account setup UX issues with Exchange autodiscover
fixed
Account settings did not display non-UTF-8 server descriptions correctly
fixed
Thunderbird sometimes sent an unnecessary "SMTPUTF8", causing some servers to reject mail
fixed
No mouseover pop was displayed with event details for non-all-day events in the Today Pane
fixed
Filtering tasks in the Today Pane did not work
fixed
Email based event scheduling displayed the date and time in a format unreadable by humans
