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

Thunderbird (64-bit)

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Thunderbird 91.2.1 (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 91.2.1 (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 91.2.1 (64-bit)

  • Thunderbird 91.2.1 (64-bit) Screenshots

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    Thunderbird 91.2.1 (64-bit) Screenshot 1
  • Thunderbird 91.2.1 (64-bit) Screenshot 2

What's new in this version:

New:
- Preference added to disable automatic pausing RSS feed updates after a fetch failure

Fixed:
- Recipeint address pills in an error state could incorrectly merge with mailing list pills when expanding the list
- BCC-only messages could not be sent from the Outbox
- Default DSN request was not set when using "Edit as New Message"
- Vertical scrollbar in "Conversations" chat panel did not work correctly
- Chat account "Advanced Options" dialog had no clickable buttons on macOS
- RSS feed attachments could not be saved
- Public ICS calendars served with an incorrect Content-Type could not be added
- Setting a CalDAV calendar to manually update had no effect
- CalDAV calendars set to read-only became writable after restarting Thunderbird
- Saving a copy of a calendar invite (More -> Save As Copy) did not work
- Events in the first or last week of a month were not always printed when printing a month view
- Accessibility improvements; clearer display of area of focus
- Various theme improvements, HiDPI improvements
- "Attachments" menu panels for attached files were empty
- Stability improvements

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