Release Notes

Unified folders now display account color indicator with account name tooltip

OAuth login for mail accounts now opens in default web browser

Thundermail services can now be used without installing an add-on

OAuth responses now verify issuer fields and reject missing required issuers

Removed Odnoklassniki chat setup and directed users to XMPP configuration

Ctrl+S did not save PDF attachments opened in Thunderbird tabs

TLS errors incorrectly reported all unknown failures as untrusted certificates

Thunderbird could crash during shutdown

Thunderbird could crash when copying an empty list of messages

New mail alerts incorrectly sized or positioned on some multi-monitor setups

Old IMAP profile migration deleted INBOX and other mailbox files

Space bar did not scroll in PDF attachments opened from emails

'Search Messages' shortcut (Ctrl+Shift+F) failed in standalone message window

Folder location widget used non-localised name

Empty confirmation dialog when more messages opened in tabs than mailnews.open_tab_warning

Removing tags from IMAP messages could fail and tags reappeared after refresh

Folder pane could not be horizontally resized in additional 3-pane tabs

Global search failed to display inaccessible messages found in local folders

Numeric subfolders were sorted alphabetically instead of naturally

Virtual folder folder-picker showed unlabeled IM account as selectable folder

Virtual folders failed to preserve the online search setting

Apple Mail OpenPGP emails failed to decrypt due to hidden recipient key ID

OpenPGP import of public key with experimental packets failed with unclear error

Performance issue when decrypting encrypted messages

Opening messages with OpenPGP keys was slow and blocked the UI for large keyrings

OpenPGP key refresh failed when fingerprint lookup returned multiple results

Invalid S/MIME encryption certificate caused misleading send errors

Esc cleared quick filter pin after changing folder

Dragging email address between compose windows failed to add recipients

Thunderbird could crash when using Find and Replace All

Sending Message dialog got stuck on "Filter complete." after successful send

Compose with PDF attachments opened PDFs instead of creating a new email

Attachments opened via -compose on Windows could use incorrect filenames

Ctrl+Enter opened attachment instead of sending the message

Compose window remained open when delayed sending was enabled

Account hub showed connection security instead of actual authentication method

Account Hub GSSAPI autoconfiguration incorrectly prompted for a password

New identity dialog lacked reply-matching and end-to-end encryption settings

Account Hub manual EWS setup lacked OAuth authentication option

Thunderbird could fail to shut down cleanly during active OAuth requests

Account Hub kept OAuth selected after changing to hostname without OAuth support

Account Hub showed a false error when returning from EWS manual configuration

Account Hub autodetect wrongly prompted for a password when auth was unavailable

QR exports with SMTP passwords generated invalid data for Thunderbird for Android

Message Filters 'Run Now' button remained disabled after filter run or mail check

Redirected CardDAV URLs resolved relative URLs against the wrong host

Thunderbird could crash when completing folder copy/move

Forwarding some Apple Mail messages incorrectly attached inline text as a file

Auto-compaction could corrupt database and cause crashes during syncs

NNTP server with invalid TLS certificate could not be added to certificate exceptions

Sent message in EWS account showed message as unread in the sent items folder

EWS NTLM authentication triggered login failures despite successful syncs

Saving inline Exchange images used incorrect filenames and file types

Cancelled message send could not be retried and hung with SMTP timeout errors

EWS folders failed to show new mail notifications until the folder was selected

Corrupted NNTP account data caused excessive memory use and startup crash

Multiple selected IMAP folders could not be moved or deleted together

Non-Latin IMAP keywords were lowercased and encoded incorrectly as MUTF-7

Message tags were lost when moving folder from local folder to IMAP folder

Reply All button was missing for some EWS messages with multiple recipients

EWS users could not permanently delete individual Trash messages

Removing a chat account threw an exception and failed to clear the UI

Primary Password policy was detected but not enforced for saved account passwords

Copying one recurring event occurrence failed to set the date when pasted

Calendar invites were incorrectly marked processed after calendar sync completed

ICS event comments were not displayed in Thunderbird event details

Visual and UX improvements

Security fixes