What's new

• Enable Thundermail OAuth sign-in with account auto-configuration
• Enable users to override OAuth provider details for EWS accounts
• Tasks can be sorted by created or modified date

Changed

• Reinstated default application check when Thunderbird starts
• OpenPGP public key no longer attached by default in signed-only messages

What’s Fixed

• Thunderbird could crash when processing message headers
• Thunderbird could crash on startup
• Calendar view tabs were not properly keyboard accessible
• Thunderbird could crash when processing new incoming messages
• On macOS, dragging attachments out of Thunderbird created multiple copies
• Cancelling a newsgroup posting was not possible
• Some IMAP emails showed current time instead of correct received date
• Search result count was missing when using 'Find in Message' or Ctrl+F
• Search results showed older irrelevant emails before newer exact matches
• Reply with selected text lost formatting for HTML messages containing
• Multipart/related attachments were not preserved when editing or forwarding
• Forwarded malformed MIME email had empty body and extra attachment
• OWL add-on description was not visible in Account Hub for non-en-US locales
• Account Hub prompted for password after OAuth login, causing Outlook setup failure
• Auto-discovered Account Hub values were not preserved for manual editing
• Account Hub links for encryption and signature opened the wrong account
• Virtual folders did not update correctly for filtered POP3 messages
• Thunderbird could crash in spam filtering
• Using thunderbird -compose with double quotes made last email address invalid
• With auto-mark-read disabled, large mail still marked as read during load delay
• It was not possible to create date-only all-day tasks
• Task context menu (right-click) had several disabled menu items
• 'Current Tasks' view showed past and finished tasks instead of only unfinished
• Visual and UX improvements
• Security fixes