Release Notes

Thunderbird Desktop

Version 52.5.0 | Released November 23, 2017

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.

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


Better support for Charter/Spectrum IMAP: Thunderbird will now detect Charter's IMAP service and send an additional IMAP select command to the server. Check the various preferences ending in "force_select" to see whether auto-detection has discovered this case.

What’s Fixed


In search folders spanning multiple base folders clicking on a message sometimes marked another message as read


IMAP alerts have been corrected and now show the correct server name in case of connection problems


POP alerts have been corrected and now indicate connection problems in case the configured POP server cannot be found


Various security fixes

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