Thunderbird 145.0

Access all your messages, calendars, and contacts in one fast app. Filter and organize the way you like. Manage all accounts separately or in a unified inbox. Thunderbird simply makes your life simple

Razvan Serea News Reporter Neowin · Nov 13, 2025 13:50 EST with 0 comments

Thunderbird

Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use.

Thunderbird is clean and elegant by default, but easily customizable to match your workflow and visual preferences. It is loaded with unique and powerful features.

Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

Thunderbird 145.0 changelog:

What’s new

Enable support for DNS over HTTPS
Account Hub email manual config option added
Add manual configuration to EWS account creation
Enable support for Microsoft Exchange via Exchange Web Services

What’s Changed

Skype has been retired and therefore dropped from Address book IM selection
Removed pref default_supports_diskspace.{HOST}
Removed pref default_offline_support_level.{HOST}
Use of the string "Junk" has been replaced with "Spam"
Stop shipping 32-bit Linux x86 binaries

What’s Fixed

'Save All' attachments with same names overwrote existing files without warning
Message headers were re-downloaded at every startup
Could not drag and drop ICS file to Today Pane
'Show remote content' did not display remote content for EML message
Emoji sequences were not properly handled in subject lines
Unified toolbar Spam button did not switch to "Not Spam" when spam message selected
Upgrading Thunderbird hid the Menu bar
When configuring external GnuPG, user was not promted to import public key
Message compose window could incorrectly disappear from Task Bar on Windows
Add-on account creation did not work with Account Hub
Owl install did not show link to website in Account Hub
Username field did not appear in Account Hub when exchange authentication failed
Disabled inputs could be toggled in Account Hub address book
Manual account setup in Account Hub defaulted Connection Security to None
Close button from Account Hub was not narrated
Account Hub email creation error notifications were not narrated
Users could not disable spinning overlay in Account Hub for email
Deleted account data remained in "Export to mobile device" menu
'Sent' and 'Spam' folders were not always created when setting up new IMAP accounts
Some third-party hosted accounts could not be created in Account Hub
Account Hub allowed keyboard shortcuts to be executed in background screen
Spam was not checked with mail.server.default.check_all_folders_for_new on
Upgrade from 128.x->140.x broke authentication for @att.net using Yahoo backend
Task reminders could fail for tasks without end dates or with shifted due dates
Visual and UX improvements
Security fixes