Release Notes

Thunderbird Desktop

Version 91.1.0 | Released September 7, 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 Changed

changed

VCard attachments now sent with "text/vcard" instead of "text/x-vcard"

What’s Fixed

fixed

Thunderbird registered Accessibility Handlers using same GUIDs as Firefox, causing performance issues for NVDA users

fixed

Focus lost when reordering accounts by keyboard in the Account Manager

fixed

Account setup did not use provider display name for setting up calendars

fixed

Various theme and UX fixes

fixed

Various security fixes

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