Release Notes

Thunderbird Desktop

Version 91.6.1 | Released February 15, 2022

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 Changed


Thunderbird generated views of meeting invitations are now expanded by default

What’s Fixed


Emails were not downloading at startup under some conditions


Port numbers were not shown in "Confirm Security Exception" dialog for CalDAV connections


Various security fixes

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