Release Notes — Thunderbird

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.
System Requirements: Details
Ctrl+A selects all filters in the Message Filters dialog
OAuth sign-in windows now explain when blocked cookies may prevent sign-in
Office 365 account setup no longer automatically offers EWS configuration
The macOS Dock badge could omit unread counts with multiple accounts
Opening a window could cause Thunderbird to crash
Undo remained disabled after deleting messages, preventing their restoration
POP3 and news messages with LF line endings could be parsed incorrectly
The option to create a mailing list was missing from File > New
Restoring toolbar defaults unexpectedly closed the customization dialog
Thunderbird did not warn before repairing folders with offline message storage
Dragging multiple selected folders moved only one folder
Renaming or moving folders could remove them from saved searches
Replies to saved messages could be blocked despite a valid Reply-To address
The spelling dictionary menu was empty in the Subject field
Tabbing from Subject field focused the header divider instead of message body
Edit as New Message did not work for some news messages
Address book setup returned to mail setup when no mail account existed
Exchange autodiscovery failed when redirected to another email address
Empty message filter conditions could cause incorrect matches
Address book filter conditions failed to match messages with missing addresses
Address book website fields incorrectly prefixed non-HTTP links with HTTPS
Some CardDAV contacts with multiline street addresses appeared empty
CardDAV contacts were saved in a format unsupported by some servers
Photos saved in vCard 3.0 contacts could fail to appear in other clients
Windows system tray icon failed to update when new mail arrived
Processing some sender addresses could freeze new mail notifications
IMAP retention settings could delete newer messages instead of older ones
Message database updates could cause Thunderbird to crash
IMAP namespace root folders could be missing or have incorrect permissions
Graph account setup failed for tenants without a SharePoint license
Various News Reader improvements
IMAP folders could disappear after restart on servers using compression
Various Feed Reader improvements
Delete Event remained enabled for read-only calendars in the Today Pane
Attendance options were missing for some recurring event series
The task list stopped updating after toolbar customization
CalDAV reminders could not be dismissed or snoozed
Some webcal calendar subscriptions were incorrectly blocked