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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 31.5.0:
  • Reading of local files through manipulation of form autocomplete
  • Out-of-bounds read and write while rendering SVG content
  • Use-after-free in IndexedDB
  • Invoking Mozilla updater will load locally stored DLL files
  • Miscellaneous memory safety hazards (rv:36.0 / rv:31.5)


  • OS X 10.6 or later

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4 193


Current Version (31.x)


Downloads 341,273
Version Downloads 2,823
Type Internet / Email
License Free
Date 25 Feb 2015
Platform Intel 64 / OS X / Intel 32
Price Free
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