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.
- 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
- Memory more...
- OS X 10.6 or later