Beta Notes — Thunderbird

Beta Notes

Thunderbird Desktop

Version 147.0beta | Released December 11, 2025

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.

These notes apply to Thunderbird version 147 beta 1 released December 11, 2025.

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

What’s Fixed

fixed

Selected status and priority not displayed in search widgets

fixed

Compacting multiple folders failed and did not compact

fixed

Spam folder could incorrectly be renamed

fixed

Resetting manual folder sorting did not work for sub folders

fixed

Gmail "All Mail" folder was displayed as "Archives" in the folder pane

fixed

Local folder names created by the user could be renamed

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

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

Learn What’s Next

Thunderbird keeps getting better. Subscribe to our newsletter and follow us on social media to stay informed.

Notice

Your browser or an extension might be blocking our donation platform, Fundraise Up.

Please try again using a different browser, or temporarily disabling the extension.