Mozilla Thunderbird makes e-mailing safer, faster, and easier with such features as intelligent spam filters, a built-in RSS reader, and quick search. Thunderbird was designed to prevent viruses and to stop junk mail. Thunderbird 3 includes tabbed e-mail, new search tools and indexing, smart folders, support for Firefox's Personas, a simplified setup wizard, and robust junk protections that include phishing and spam filters.
What's new in this version:
Version 11.0 has a new user interface with Tabs above the main menu bar to facilitate navigation and make it more contextual and fixes for crash seen during importing of Microsoft Outlook profiles and notifications may not work properly with Growl 1.3 or later.