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

Thunderbird for Mac

Thunderbird 38.4.0

  -  66.72 MB  -  Open Source

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 38.4.0.


For those interested in downloading the most recent release of Thunderbird for Mac 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!

  • Thunderbird 38.4.0 Screenshots

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    Thunderbird 38.4.0 Screenshot 1
  • Thunderbird 38.4.0 Screenshot 2
  • Thunderbird 38.4.0 Screenshot 3
  • Thunderbird 38.4.0 Screenshot 4
  • Thunderbird 38.4.0 Screenshot 5

What's new in this version:

- Fixed issue where messages moves of multiple messages from a maildir folder to an mbox folder failed

Security fixes:
- NSS and NSPR memory corruption issues
- Mixed content WebSocket policy bypass through workers
- Vulnerabilities found through code inspection
- JavaScript garbage collection crash with Java applet
- Memory corruption in libjar through zip files
- CORS preflight is bypassed when non-standard Content-Type headers are received
- Buffer overflow during image interactions in canvas
- Trailing whitespace in IP address hostnames can bypass same-origin policy
- Miscellaneous memory safety hazards (rv:42.0 / rv:38.4)