Software Update: Mozilla Thunderbird 91.2.0

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The Mozilla Foundation has released version 91.2.0 of Thunderbird. Thunderbird is an open source email and newsgroup client, with features such as support for several mail and news accounts, a spam filter, spell checker, and a customizable appearance. In version 91 has included a warning when an email is sent to a possibly non-existent address, or when there are too many addresses in the public address line. There is also support for CardDAV and there is a native client for a Mac equipped with an Apple Silicon processor.

At the moment it is not yet possible to do an automatic update from version 78 to 91. Manually downloading and running the installation file can update an existing installation. This automatic migration will be added in a future version. The following changes and improvements have also been made in this release:


  • Saving a single message as .eml now uses a unique filename


  • New mail notifications did not properly take subfolders into account
  • Decrypting binary attachments when using an external GnuPG configuration failed
  • Account name fields in the account manager were not big enough for long names
  • LDAP searches using an extensibleMatch filter returned no results
  • Read-only CalDAV calendars and CardDAV address books were not detected
  • Multipart messages containing a calendar invite did not display any of the human-readable alternatives
  • Some calendar days were displayed incorrectly or duplicated (eg. two “29th” days of a particular month)
  • Phantom event was shown at the end of each day in Calendar week view
  • Various security fixes

Version number 91.2.0
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10, Windows 11
Website Mozilla Foundation
License type Conditions (GNU/BSD/etc.)
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