Release Notes

Thunderbird Desktop

Version 91.0.1 | Released August 17, 2021

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 91 is only offered as direct download from thunderbird.net and not as an upgrade from Thunderbird version 78 or earlier.** A future release will provide updates from earlier versions.

System Requirements: Details

  • Windows: Windows 7 or later
  • macOS: macOS 10.12 or later (macOS 11.0 for Silicon)
  • Linux: GTK+ 3.14 or higher

What’s Fixed

fixed

OTR chat encryption failed on 32-bit Windows builds

fixed

Various security fixes

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