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As of July 2012, Thunderbird has transitioned to a new governance model, with new features being developed by the broader free software and open source community, and security fixes and improvements handled by Mozilla.

Thunderbird is a free, open-source, cross-platform e-mail and news client developed by the Mozilla Foundation. The project strategy is modeled after Mozilla Firefox, a project aimed at creating a Web browser.

What's New

Version 38.4.0:
Bug Fixes
  • 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 more...


  • OS X 10.6 or later

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4 203


Current Version (38.x)


Downloads 357,137
Version Downloads 805
Type Internet / Email
License Free
Date 28 Nov 2015
Platform Intel 64 / OS X / Intel 32
Price Free
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