Thunderbird Desktop
Version 147.0 | Released January 13, 2026
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
- Windows: Windows 10 or later
- Mac: macOS 10.15 or later
- Linux: GTK+ 3.14 or higher
What’s New
new
Add "Show Full Path" folder pane option for compact view modes
new
Add `mail.useLocalizedFolderNames' to toggle special folder name localization
What’s Changed
changed
Special folders are now localized based on a restricted set of names
What’s Fixed
fixed
Selected status and priority was not displayed in search widgets
fixed
Compacting multiple folders failed and did not compact
fixed
Resetting manual folder sorting did not work for sub folders
fixed
Unified archive subfolders could show wrong names and no messages
fixed
Folders with deep hierarchy and long folder names could fail to display
fixed
Moving saved search/virtual folder under IMAP could fail
fixed
"Open and Show" for OpenPGP-signed message (.eml) did not work
fixed
"Search Messages" search did not finish due to unparsable local folders
fixed
Compose command line flag no longer worked correctly
fixed
Search for "Attachment" in Settings menu did not find "Files and Attachments"
fixed
Account Hub did not show error message on failure when creating OAuth2 EWS account
fixed
Thunderbird could crash during exchange address account setup
fixed
Japanese locale users could not create message filters
fixed
Moving virtual folder within maildir based IMAP or local folder could fail
fixed
Thunderbird could crash when marking all messages as read
fixed
Startup could be slow with large number of folders not using subscriptions
fixed
EWS message send that required a password errored instead of prompting
fixed
EWS HTTP 500 backoff errors were not handled gracefully
fixed
SMTP sending could hang when when multiple messages queued for sending
fixed
Thunderbird could crash when emptying EWS trash
fixed
Broken feed icon could prevent updating of feeds
fixed
Calendar did not alert user for connection issues
fixed
Creation of tasks with Start or Due date was not possible
fixed
Visual and UX improvements
