Thunderbird Desktop
Version 91.4.0 | Released December 7, 2021
Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.
For more on all the new features in Thunderbird 91, see New in Thunderbird 91.0.
System Requirements: Details
- Windows: Windows 7 or later
- Mac: macOS 10.12 or later
- Linux: GTK+ 3.14 or higher
What’s Fixed
fixed
IMAP startup performance improved for accounts with a multitude of folders
fixed
Thunderbird failed to send messages when configured to use an IPv6 SMTP server by IP address (instead of a hostname)
fixed
Forwarding messages with attachments sometimes failed
fixed
Printing multiple messages at once was not possible
fixed
Non-utf8 news groups were not supported
fixed
Thunderbird stalled after sending a message with NNTP and SMTP recipients
fixed
Using Thunderbird with multiple language packs caused high RAM and CPU use and sluggish performance
fixed
Clicking a "mailto:" started the composer with the default sending identity instead of a configured alternate
fixed
Drag and dropped text into a plain text message in the compose window was handled inconsistently
fixed
FileLink messages did not display correctly when viewed in Outlook
fixed
In account setup, after selecting an extension provided protocol, it was not possible to create an IMAP/POP account
fixed
Multiday selections were not cleared when changing week viewed
fixed
When creating a new event by clicking and dragging the mouse to create a box, the view did not auto-scroll after reaching the bottom
fixed
Calendar Invitation Panel did not scroll when multiple invitations were pending
fixed
Calendar print dialog did not have a cancel button
fixed
Various security fixes
Learn What’s Next
Thunderbird keeps getting better. Subscribe to our newsletter and follow us on social media to stay informed.
