Release Notes

Thunderbird Desktop

Version 91.2.1 | Released October 21, 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.

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 New

new

Preference added to disable automatic pausing RSS feed updates after a fetch failure

What’s Fixed

fixed

Recipeint address pills in an error state could incorrectly merge with mailing list pills when expanding the list

fixed

BCC-only messages could not be sent from the Outbox

fixed

Default DSN request was not set when using "Edit as New Message"

fixed

Vertical scrollbar in "Conversations" chat panel did not work correctly

fixed

Chat account "Advanced Options" dialog had no clickable buttons on macOS

fixed

RSS feed attachments could not be saved

fixed

Public ICS calendars served with an incorrect Content-Type could not be added

fixed

Setting a CalDAV calendar to manually update had no effect

fixed

CalDAV calendars set to read-only became writable after restarting Thunderbird

fixed

Saving a copy of a calendar invite (More -> Save As Copy) did not work

fixed

Events in the first or last week of a month were not always printed when printing a month view

fixed

Accessibility improvements; clearer display of area of focus

fixed

Various theme improvements, HiDPI improvements

fixed

"Attachments" menu panels for attached files were empty

fixed

Stability improvements

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