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 (NNTP) client developed by the Mozilla Foundation. The project strategy is modeled after Mozilla Firefox, a project aimed at creating a Web browser.
- Links were not always detected properly in the message body (terminated early on "|", some long links not detected at all)
- Invitations to events could not be printed.
- Falsely reported not enough disk space during compacting
- Dragging and dropping of contacts from the contact list onto an addressbook while All Addressbooks is selected moved only one contact
- OS X 10.6 or later