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.
- GMail supports OAuth2 authentication, removing the need to manually select "allow less secure applications" in Google options for the account.
- Ship Lightning calendar addon with Thunderbird and enable with an opt-out dialog
- Filter sent messages
- Filter messages when archived
- Enable search in multiple/all address books
- Add support for more...
- OS X 10.6 or later