Mozilla Thunderbird versions

v120.0 [Jul 24, 2024]
New
UI density now affects multi-message view
New
Added new preference mail.addressDisplayFormat to always display full name and email address of all recipients in message list
New
"Archived-At" message header field is now displayed as a link, and Message Permalink option is now available in List-Id menu
New
Threaded message views now include "New Message" count
New
Cards View hover and selection paradigms introduced to better support custom themes and accent colors
New
Added account context menu to Unified Toolbar "Get Messages" button, creating quick access option to retrieve new messages for individual accounts
New
OpenPGP no longer attempts to re-initialize secret key storage if individual OpenPGP secret key passphrases have been enabled
New
OpenPGP Key Manager can now create revocation statements for any secret key
New
A nested OpenPGP message's signature status is now viewable
New
Changing expiration of OpenPGP keys with a "complex" structure is now supported
New
Enabled ECDH encryption and decryption for S/MIME messages
New
Custom account colors are now shown in the "From" field when composing a message
New
Manual account configuration now implements form validation
New
iCloud contacts and calendar discovery now supported when using a dedicated app password
New
Improved layout of LDAP address book properties dialog
New
Thunderbird now uses native Windows notifications
New
Added support for OS-specific accent colors
New
Added system accent color support for various elements
New
Selection indicator added to folder pane and address book pane
New
Thunderbird now decodes messages nested in attachments even if decodeSubMessages preference is set to "false"
What’s Changed
Changed
Improved Cards View readability and accessibility
Changed
Better threading and unread/new indicators for Cards View threaded messages
Changed
Removed Account Provisioner
Changed
Search bars in Thunderbird now use a common custom element for more consistency
Changed
Updated donation link from "give.thunderbird.net" to "www.thunderbird.net/donate/"
Changed
Activity Manager now shows account and full folder path when indexing
Changed
Spam and Junk message styling in Card UI adjusted to be less distracting
Changed
Removed mail.openpgp.key_assistant.enable preference
Changed
Disabled support for LibrePGP v5 AEAD/OCB decryption
Changed
"Permissive" importing of problematic OpenPGP keys now disabled by default; Set mail.openpgp.allow_permissive_import to allow
Changed
A warning is now displayed when importing OpenPGP keys that advertise unsupported features
Changed
Default sort order of messages in message list changed to descending (newest at top)
Changed
Added Show more/less buttons to notifications in Account Hub
Changed
Removed "Becky! Internet Mail" importer
Changed
The "prefer display name" preference for individual contacts was removed in favor of the global preference
Changed
Address book updated to new card design
Changed
Addressbook toolbar updated with the same UI/UX paradigms of the folder pane
Changed
Folder alerts now display full path of affected folder
Changed
IMAP "Too Many Connections" alerts now display IMAP server name
Changed
Date range intervals in "Find Events" panel updated
Changed
Calendar ICS file import now always uses new importer
What’s Fixed
Fixed
Thunderbird "--migration" flag opened empty window
Fixed
"Confirm Deletion" prompt was incorrectly shown when deleting messages with Grouped By header also selected
Fixed
Thunderbird did not remove temporary directory created from adding attachment to message via drag-and-drop
Fixed
Certificate errors silently failed when fetching new messages
Fixed
Clicking on native Windows notifications did not bring Thunderbird to the foreground
Fixed
3-pane view was blank after starting Thunderbird with unsent messages in outbox
Fixed
Some menu bar items did not work with all Thunderbird windows closed on macOS
Fixed
Sender in multi-message view was right aligned when the text wrapped to multiple lines
Fixed
"Find in this message" did not work in multi-message view
Fixed
Non-compliant "References" headers were not handled gracefully when mailnews.headers.showReferences was set
Fixed
"news://" URIs failed opening as links or from the commandline
Fixed
Thunderbird sometimes displayed a blank screen on startup
Fixed
Standalone window titles no longer included message subject on macOS
Fixed
Links with IP address as link text and destination incorrectly warned user that link text and destination did not match
Fixed
"Open message in conversation" and "Open message in containing folder" from a standalone window failed
Fixed
"Get Messages" toolbar button was initially disabled after opening a message from a file in a new window
Fixed
"Open Browser With Message-ID" failed for Google Groups due to URL change
Fixed
Focus behavior for opening messages in a new tab changed depending on state of mail.tabs.loadInBackground preference

v78.1 [Jul 31, 2020]
- FIXED: OpenPGP could not be disabled for an account if a key was previously configured.
- FIXED: Recipients were unable to decrypt some messages when the sender had changed the message encryption from OpenPGP to S/MIME.
- FIXED: Contacts moved between CardDAV address books were not synced to the new server.
- FIXED: CardDAV compatibility fixes for Google Contacts.
- FIXED: Folder pane had no clear indication of focus on macOS.
- FIXED: Windows theme improvements.
- FIXED: Various security fixes.

v68.2 [Oct 23, 2019]
- NEW: Message Search WebExtension API.
- FIXED: Better visual feedback for unread messages when using the dark theme.
- FIXED: Various issues when editing mailing lists.
- FIXED: Integration with macOS addressbook and notifications not working after introduction of notarization.
- FIXED: Application windows not maintaining their size after restart.
- FIXED: Issues when upgrading from a 32bit version of Thunderbird to a 64bit version.

v60.8 [Jul 9, 2019]
- CHANGED: Calendar: Problems when editing event times, some related to AM/PM setting in non-English locales.
- FIXED: Various security fixes.

v60.6 [Mar 19, 2019]
- FIXED: Various security fixes.
- UNRESOLVED: Due to changes in the Mozilla platform profiles stored on Windows network shares addressed via drive letters are now addressed via UNC
- UNRESOLVED: Chat: Twitter not working due to API changes at Twitter.com

v60.3 [Oct 31, 2018]
- Fixed: Various Theme fixes where incorrect colors, backgrounds, etc. were displayed.
- Fixed: Add-on Options menu not working on Mac.
- Fixed: Shift PageUp/PageDown in Write window.
- Fixed: Saving content of Write windows didn't overwrite existing file.
- Fixed: Issues related to "Edit Template" command.
- Fixed: Gloda attachment filtering.
- Fixed: Mailing list address auto-complete enter/return handling.
- Fixed: Thunderbird hung if HTML signature references non-existent image.
- Fixed: Filters not working for headers that appear more than once.
- Fixed: Various security fixes.

v60.0 [Aug 17, 2018]
- new: When writing a message, a delete button now allows the removal of a recipient. This delete button is displayed when hovering the To/Cc/Bcc selector.
- new: Many improvements to attachments handling during compose: Attachments can now be reordered using a dialog, keyboard shortcuts, or drag and drop. The "Attach" button moved to the right to be above the attachment pane. The access key of the attachment pane (e.g. Alt M, may vary depending on localization, Ctrl M on Mac) now also works to show or hide the pane. The attachment pane can also be shown initially when composing a new message. Right-click on the header to enable this option. Hiding a non-empty attachment pane will now show a placeholder paperclip to indicate the presence of attachments and avoid sending them accidentally.
- new: "Edit Template" command. This also solves various problems when saving as template (duplicates created, message ID lost).
- new: "New Message from Template" command.
- new: Allow changing the Spellcheck Language from status bar.
- new: Light and Dark themes.
- new: WebExtension themes are now enabled in Thunderbird.
- new: A default startup directory in the address book window can now be configured.
- new: Individual feed update interval.
- new: An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.
- new: OAuth2 authentication for Yahoo and AOL.
- new: FIDO U2F support.
- new: Thunderbird now allows the conversion of folders from mbox to maildir format and vice versa. This is an experimental feature that needs to be enabled by setting the preference mail.store_conversion_enabled. Note that this functionality does not not work if the option "Allow Windows Search/Spotlight to search messages" is selected.
- new: Calendar: Allow copying, cutting or deleting of a selected occurrence or the entire series for recurring events.
- new: Calendar: Provide an option to display locations for events in calendar day and week views.
- new: Calendar: Provide the ability for sending/not sending meeting notifications directly instead of showing a popup.
- new: Calendar: Option to select the target calendar when pasting an event or task.
- new: Calendar: Allow email scheduling for CalDAV servers supporting server-side scheduling.
- new: Thunderbird Chat now contains multiple built-in message themes.
- changed: IMPORTANT: Add-ons not marked as compatible with Thunderbird 60 by their authors will be disabled (this can be reverted via preference extensions.strictCompatibility).
- changed: IMAP: When after sending a message storing that sent message fails, the message can now be stored in a local folder.
- changed: Add-on options can no longer be configured from the Add-on Manager page. A new menu item "Add-on Options" is now available on the Tools menu.
- changed: When messages are composed in paragraph format, "body text" and split mail quotes are converted to paragraphs when pressing the enter key.
- changed: "Edit As New Message" will now use the account's default compose format, either HTML or plain text ignoring the format of the message. Plain text messages will be converted to HTML and vice versa. Then using the modifier, the format choice will be reverted.
- changed: The "Edit Draft" command now also honors the use of the shift key to convert HTML to plain text or vice versa when editing a draft.
- changed: The plain text to HTML conversion has been improved where such a conversion is necessary for "Edit As New Message" or when the shift modifier is used for "Edit Draft" or "New Message from Template".
- changed: During address entry, the matching part of the address is now shown in bold. Preference mail.autoComplete.commentColumn allows to display the address book where the address is stored.
- changed: When attaching a message via drag and drop, the subject of the message is now used as attachment name instead of "Attached Message".
- changed: Better address book photo handling: Photos can be added by drag and drop and a copy of all photos will be stored in the Thunderbird profile.
- changed: On first start, Thunderbird now shows the account setup dialog, no longer the account provisioner dialog.
- changed: Thunderbird follows Firefox' Photon design with rectangular tabs and many other theme improvements.
- changed: When customizing the From: address, Thunderbird will now use this address for the SMTP "MAIL FROM" command. Previously the address configured in the identity was used. The preference mail.smtp.useSenderForSmtpMailFrom allows return to the previous behavior.
- changed: Native notifications on Linux are now re-enabled.
- changed: Thunderbird now uses Mozilla's latest proxy technology (add-on FoxyProxy now supported).

v52.5 [Jan 22, 2018]
- Folder pane toolbar and folder view selector (replacement for folder view arrows).
- Optionally remove corresponding data files when removing an account from Thunderbird.
- Import settings from Becky! Internet Mail.
- Possibility to copy message filter.
- Dictionary setting is restored when editing a draft. Content-Language header (RFC 3282) transmitted with message.
- Calendar: Event can now be created and edited in a tab.
- Calendar: Processing of received invitation counter proposals.
- Chat: Support Twitter Direct Messages.
- Chat: Liking and favoriting in Twitter.
- Chat: XMPP: Support SASL SCRAM authentication mechanism.
- Chat: Support Jabber/XMPP Message Carbons (XEP-280).
- The way images are included in a compose window has changed. Images are now included as data URIs and not as references to parts of other messages or operating system files. This allows better interoperability with office packages such as MS Office or LibreOffice. Images linked from locations on the internet will no longer be downloaded and attached to the message automatically. This can be changed for each image individually via the Image Properties dialog or globally by setting the preference mail.compose.attach_http_images.
- Correspondents column now default for all new folders, can be switched off with preference mail.threadpane.use_correspondents.
- When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header.
- Formatting toolbar is now left in place when delivery format is switched to plain text only.
- Messages in IMAP folders read on external device are now filtered by default.
- Folders backed by mbox storage larger than 4GB are supported without warning (unless preference mailnews.allowMboxOver4GB is set to false).
- IMAP caching now uses Mozilla's latest caching technology.
- The keyboard shortcut to insert hyperlinks into a compose window was changed from CTRL L to CTRL K to align with Office applications.
- Chat: Removed Yahoo! Messenger support (since Yahoo removed support).
- Fixed Message preview pane non-functional after IMAP folder was renamed or moved.
- Fixed Editing in paragraph format: Pressing Shift Enter sometimes doesn't move the cursor to the next line.
- Fixed Various corrections when composing messages in paragraph format.
- Fixed Paste as quotation doesn't always work.
- Fixed Long lines in plain text replies not properly wrapped.
- Fixed Undesired white-space before signature in paragraph mode.
- Fixed When attachment unavailable, compose shows endless "Attaching..." message instead of error.
- Fixed Text encoding of reply sometimes incorrect (uses encoding of last viewed message).
- Fixed Text encoding of message display, reply or forwarded message sometimes incorrect (uses encoding of attachment).
- Fixed Delivery Format not preserved for saved drafts (Auto-Detect|Plaintext|HTML|Both).
- Fixed Reply to own e-mail does not reply with the correct identity.
- Fixed IMAP message part caching.
- Fixed Links with escaped non-ASCII (international) characters can't be clicked.
- Fixed Calendar: Events specified in timezone "local time" generate alerts in UTC time.
- Fixed Chat: XMPP Resource collisions.
- Various security fixes.

v45.8 [Mar 7, 2017]
Various security fixes

v45.7 [Jan 25, 2017]
Fixed: crash when viewing certain IMAP messages.

v45.6 [Dec 28, 2016]
Fixed: The system integration dialog was shown every time when starting Thunderbird
Fixed: Various security fixes

v45.5 [Nov 18, 2016]
Changed recipient address entry: Arrow-keys now copy the pop-up value to the input field. Mouse-hovered pop-up value can no longer be confirmed with tab or enter key.
Support changes to character limit in Twitter
Fixed: Reply with selected text containing quote resulted in wrong quoting level indication
Fixed: Email invitation might not be displayed when description contains non-ASCII characters
Fixed: Attempting to sort messages on the Date field whilst a quick filter is applied got stuck on sort descending
Fixed: Mail address display at header pane displayed incorrectly if the address contains UTF-8 according to RFC 6532.

v45.4 [Oct 1, 2016]
Fixed: "Apply columns to..." did not honor special folders
Fixed: Threading broken when editing message draft, due to loss of Message-ID
Fixed Mail saved as template copied In-Reply-To and References from original email.
Fixed: Additional spaces were inserted when drafts were edited.
Fixed: Recipient addresses were shown in red despite being inserted from the address book in some circumstances.
Fixed: Display name was truncated if no separating space before email address.

v45.3 [Aug 30, 2016]
Fixed certain messages caused corruption of the drafts summary database.
Fixed "edit as new message" on a received message pre-filled the sender as the composing identity.
Fixed: Disposition-Notification-To could not be used in mail.compose.other.header
Various security fixes.

v45.2 [May 23, 2016]
Various security fixes
Invitations to events could not be printed.
Dragging and dropping of contacts from the contact list onto an addressbook while All Addressbooks is selected moved only one contact
Falsely reported not enough disk space during compacting
Links were not always detected properly in the message body (terminated early on "|", some long links not detected at all).

v38.7 [Mar 14, 2016]
Fixed in Thunderbird 38.7
2016-37 Font vulnerabilities in the Graphite 2 library
2016-35 Buffer overflow during ASN.1 decoding in NSS
2016-34 Out-of-bounds read in HTML parser following a failed allocation
2016-31 Memory corruption with malicious NPAPI plugin
2016-27 Use-after-free during XML transformations
2016-24 Use-after-free in SetBody
2016-23 Use-after-free in HTML5 string parser
2016-20 Memory leak in libstagefright when deleting an array during MP4 processing
2016-17 Local file overwriting and potential privilege escalation through CSP reports
2016-16 Miscellaneous memory safety hazards (rv:45.0 / rv:38.7)

v38.6 [Feb 13, 2016]
Various security fixes.
Filters ran on a different folder than selected
For Windows systems on roaming profiles, could not display messages after Thunderbird update (related to Lightning updates)

v38.2 [Aug 14, 2015]
Hardware acceleration is now disabled by default to avoid crashing Thunderbird
A few bugs have been fixed to avoid crashing Thunderbird

v38.1 [Jul 10, 2015]
What’s New
Fixed
Copy/Paste into plain text editor deletes newlines from quoted text (bug 1143570)
Fixed
Cross-posts won't send because Newsgroups: groups are separated with comma space, not just comma (bug 1151448)
Fixed
Cannot send email through exchange server (NTLM) (bug 1174159)
Fixed
Doesn't display GB2312 encoded texts correctly for Chinese Characters (bug 1174580)
Fixed
OAuth2 authentication for GMail does not work when specified server is imap.gmail.com or smtp.gmail.com. (bug 1176773)

v31.7 [May 15, 2015]
Fixed in Thunderbird 31.7
2015-57 Privilege escalation through IPC channel messages
2015-54 Buffer overflow when parsing compressed XML
2015-51 Use-after-free during text processing with vertical text enabled
2015-48 Buffer overflow with SVG content and CSS
2015-47 Buffer overflow parsing H.264 video with Linux Gstreamer
2015-46 Miscellaneous memory safety hazards (rv:38.0 / rv:31.7)

v31.2 [Oct 14, 2014]
FIXED
Fixed a case where having a contact and card in an address book with the same name could send to the mailing list (Bug 1008718)
FIXED
Invalid certificate issue with mozilla::pkix (see bug 1042889)
FIXED
Importing an RSA private key fails if p < q (see bug 1049435)

v31.1 [Sep 2, 2014]
Fixed an issue where mailing lists with spaces in their names couldn't be autocompleted (Bug 1060901)
Fixed an occasional startup crash (Bug 1005336)

v31.0 [Jun 13, 2014]
- Autocompleting email addresses now matches against any part of the name or email
- Composing a mail to a newsgroup will now autocomplete newsgroup names
- Insecure NTLM (pre-NTLMv2) authentication disabled

v24.6 [Jun 10, 2014]
Fixed in Thunderbird 24.5
MFSA 2014-46 Use-after-free in nsHostResolve
MFSA 2014-44 Use-after-free in imgLoader while resizing images
MFSA 2014-43 Cross-site scripting (XSS) using history navigations
MFSA 2014-42 Privilege escalation through Web Notification API
MFSA 2014-38 Buffer overflow when using non-XBL object as XBL
MFSA 2014-37 Out of bounds read while decoding JPG images
MFSA 2014-35 Privilege escalation through Mozilla Maintenance Service Installer
MFSA 2014-34 Miscellaneous memory safety hazards (rv:29.0 / rv:24.5)

v24.1 [Oct 29, 2013]
- Fixed an issue where inline spell check in the compose window could stop working
- Fixed an occasional crash in the subscribe dialog for newsgroups
- Fixed some color contrast issues

v15.0 [Jul 18, 2012]
Mail Account Setup Wizard
Tabbed Email
One-click Address Book
Attachment Reminder
Multiple-channel chat

v10.0
- New ability to search the Web
- Improvements to email search
- Several fixes when drafting email
- and several other platform fixes

v3.1
The latest version of Thunderbird comes with more new features: it's more responsive and faster to start up and use, is based on the new Mozilla Gecko 5 engine, has a New Add-ons Manager, has revised account creation wizard, has a new Troubleshooting Information page, tabs can now be reordered and dragged to different windows, attachment sizes are now displayed along with attachments, there are several theme fixes for Windows Vista and Windows 7. Speed, performance, stability and security were improved.