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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 31.6.0:
Security Fixes
  • Same-origin bypass through anchor navigation
  • CORS requests should not follow 30x redirections after preflight
  • resource:// documents can load privileged pages
  • Use-after-free when using the Fluendo MP3 GStreamer plugin
  • Miscellaneous memory safety hazards (rv:37.0 / rv:31.6)


  • OS X 10.6 or later

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4 194


Current Version (31.x)


Downloads 344,130
Version Downloads 2,578
Type Internet / Email
License Free
Date 02 Apr 2015
Platform Intel 64 / OS X / Intel 32
Price Free
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