Thunderbird Monthly releases are now the default download. Click to learn more

Release Notes

Thunderbird Desktop

Version 52.4.0 | Released October 6, 2017

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:
• Window: Windows XP, Windows Server 2003 or later
• Mac: Mac OS X 10.9 or later
• Linux: GTK+ 3.4 or higher

Details here.

Please refer to Release Notes for version 52.0 to see the list of improvements and fixed issues.

What’s New

new

In Thunderbird 52 a new behavior was introduced for replies to mailing list posts: "When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header". A new preference mail.override_list_reply_to allows to restore the previous behavior.

What’s Fixed

fixed

Under certain circumstances (image attachment and non-image attachment), attached images were shown truncated in messages stored in IMAP folders not synchronised for offline use.

fixed

IMAP UIDs > 0x7FFFFFFF not handled properly

fixed

Various security fixes

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.