Release Notes

Thunderbird Desktop

Version 115.6.1 | Released January 8, 2024

Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.

For help and a quick start on Thunderbird 115, see Thunderbird 115 Supernova FAQ.

For more on all the new features in Thunderbird 115, see What’s New in Thunderbird 115.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher

What’s New


OAuth2 now supported for

What’s Fixed


High CPU usage sometimes occurred with IMAP CONDSTORE (conditional STORE) enabled


Replying to a collapsed thread via keyboard shortcut (Ctrl+R/Cmd+R) opened a reply for every message in the thread


Enabling Grouped By view after reversing sort order of column header caused messages to be grouped incorrectly


Opening thread pane context menu via keyboard did not always scroll view to selection


New mail indicator for POP3 accounts did not indicate new messages ready to be downloaded


Messages could not be moved to folders using Message > Move To if text or a link in the message had been clicked on first


MIME part boundaries were not properly terminated

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