Release Notes

Thunderbird Desktop

Version 102.7.0 | Released January 19, 2023

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.

Thunderbird 102.7.0 will not automatically update due to a critical authentication issue with Microsoft 365 Business accounts. Affected users should not update until Thunderbird 102.7.1 is released with a fix. See Known Issues below. Opening the "About Mozilla Thunderbird" dialog will allow an update to 102.7.0.

For more on all the new features in Thunderbird 102, see What’s New in Thunderbird 102.

System Requirements: Details

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

What’s New


Enterprise policies now support Thunderbird-specific preferences

What’s Fixed


Localized builds and langpacks now use "comm-l10n" repository; downstream builds using official langpacks should not need to make changes


Having too many folders open at startup caused loss of MSF files


Copying an email from one local folder to another local folder sometimes caused "Another Operation is using the folder" error on Windows 7


Email address pill allowed for incorrectly formatted email addresses


Creating security exceptions for messages sent using a self-signed certificate failed if hostname contained uppercase letters


S/MIME certificate verification was prohibitively slow


OpenPGP key import failed for key blocks with comments that contain Unicode characters


Chat conversation sidebar was too wide under certain circumstances, making scrollbar unusable


On Mac, deleting events from Today Pane with "Backspace" key deleted selected messages instead


Various security fixes

Known Issues


OAuth2 authentication not working for Microsoft 365 Enterprise accounts. See the Blog post for additional information. Bug 1810760

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