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Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.
Join UsVersion 92.0beta, first offered to channel users on August 13, 2021
Tags are now colored in mail filter editor
Thunderbird registered Accessibility Handlers using same GUIDs as Firefox, causing performance issues for NVDA users
Focus lost when reordering accounts by keyboard in the Account Manager
Recipient autocomplete always preferred the primary email address for a contact
Improvements to the Import/Export feature
LDAP performance improvements
OTR chat encryption failed on 32-bit Windows builds
Status checkmark on View > Calendar > Calendar Pane > Show Calendar Pane was reversed
Filtering tasks in the Today Pane did not work
Email based event scheduling displayed the date and time in a format unreadable by humans
Various theme, UX, and visual fixes
Folder icons could be overridden by linked favicons in HTML messages
Various theme and UX fixes
New chat messages were not visible (white text on white background) in dark mode
Various theme and UX fixes
Preference for disabling the unread message count badge on Windows taskbar icon added: mail.biff.show_badge
Context menu items related to OpenPGP and attachments are now hidden when not applicable
Extensions listed on the Recommended Addons did not have a clear way to view details in a browser
mid: URLs in calendar invites did not open the linked mail message
Compose window attachment pane did not close when disabling signing of an OpenPGP message
Unread message count badge on Windows tray icon did not update after moving messages to the Junk folder
Using "Reply to List" with some list emails incorrectly opened a "no-reply" warning
Unified folders showed no messages when underlying folders were removed
Folder pane toolbar did not always persist after restarting Thunderbird
Creating a new account with manual setup failed
Account setup UX issues with Exchange autodiscover
Account settings did not display non-UTF-8 server descriptions correctly
Thunderbird sometimes sent an unnecessary "SMTPUTF8", causing some servers to reject mail
Various CardDAV setup and auto-detection fixes
Dates (such as birthday) stored in contacts may display the wrong date; a one-time manual fix may be needed for dates that are incorrect.
No mouseover pop was displayed with event details for non-all-day events in the Today Pane
Menu item for disabling subject encryption for a single message added
VCard attachments now sent with "text/vcard" instead of "text/x-vcard"
Account setup did not use provider display name for setting up calendars
Enable "print message" only when one message is selected
New mail notifications did not properly take subfolders into account
Enabled/Disabled state of message filters did not persist as expected
Printing a message did not print a list of its attachments
Images attached from a web page were not sent as expected
LDAP address books using Kerberos/GSS-API authentication did not authenticate
Calendar event editor did not honor mail.spellcheck.inline
Thunderbird may hang when sending a message if "Check spelling before sending" is enabled in Preferences