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. Just as Firefox aims to redefine the web browser, Thunderbird is a refinement of the mail and news interface. On December 7, 2004, version 1.0 was released, and received over 500,000 downloads in its first three days of release (and 1,000,000 in 10 days). As of 2007, Thunderbird has been downloaded more than 50 million times since 1.0 release.