Thunderbird Notes

Version 52.6.0, first offered to Release channel users on January 25, 2018

Check out "What’s New" and "Known Issues" for this version of Thunderbird below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. If interested, please see the complete list of changes in this release.

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

  • Fixed

    Searching message bodies of messages in local folders, including filter and quick filter operations, not working reliably: Content not found in base64-encode message parts, non-ASCII text not found and false positives found.

  • Fixed

    Defective messages (without at least one expected header) not shown in IMAP folders but shown on mobile devices

  • Fixed

    Calendar: Unintended task deletion if numlock is enabled

  • Fixed

    Various security fixes