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.
Fixed an issue where long messages with multiple signatures could end up unreadable (bug 929006)
Fixed an issue where editing account settings was not possible in some non-standard configurations of local folder set-ups (bug 921371)
Intel, OS X 10.6 or later