A free email application from Mozilla that's easy to set up and customize

Thunderbird (64-bit)

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Thunderbird 91.0.3 (64-bit)

  -  53.8 MB  -  Open Source
Free Download

Security Status

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of Thunderbird 91.0.3 (64-bit).


For those interested in downloading the most recent release of Thunderbird (64-bit) or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

Download Thunderbird 91.0.3 (64-bit)

  • Thunderbird 91.0.3 (64-bit) Screenshots

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    Thunderbird 91.0.3 (64-bit) Screenshot 1
  • Thunderbird 91.0.3 (64-bit) Screenshot 2

What's new in this version:

Fixed:
- Folder icons could be overridden by linked favicons in HTML messages
- Unified folders showed no messages when underlying folders were removed
- Folder pane toolbar did not always persist after restarting Thunderbird
- Compose window attachment pane did not close when disabling signing of an OpenPGP message
- Using "Reply to List" with some list emails incorrectly opened a "no-reply" warning
- Unread message count badge on Windows tray icon did not update after moving messages to the Junk folder
- Account setup UX issues with Exchange autodiscover
- Account settings did not display non-UTF-8 server descriptions correctly
- Thunderbird sometimes sent an unnecessary "SMTPUTF8", causing some servers to reject mail
- No mouseover pop was displayed with event details for non-all-day events in the Today Pane
- Filtering tasks in the Today Pane did not work
- Email based event scheduling displayed the date and time in a format unreadable by humans

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