Thunderbird, as a messaging system, is uniquely positioned as the tool that users can use to integrate as many of their communications as they want. By combining an open architecture, a powerful extensibility and customization framework, and a person-centric perspective on communications, Thunderbird is a powerful yet enjoyable tool to help individuals manage their online interactions - whether that’s email, instant messaging, social networking messages, or other types of message. Thunderbird will evolve to embrace the Web, by continuing to blur the distinction between what’s on the web and what’s on the desktop, while keeping in mind the importance of keeping the individual in charge of their online experience.

• Mozilla Thunderbird manages multiple POP and IMAP email accounts and reads RSS feeds.
• A junk mail filter using Bayesian statistics cans spam automatically in Mozilla Thunderbird.
• Mail views, free-form message tags and flexible filters let you organize and prioritize good mail easily.
• Searches can be saved to virtual folders that automatically aggregate relevant mail in Thunderbird.
• Mozilla Thunderbird offers rich, but security and privacy conscious HTML formatting support.
• Mail classified as junk can automatically be sanitized, Thunderbird detects common scam tactics.
• S/MIME support lets you encrypt and sign mail in Mozilla Thunderbird (OpenPGP plug-in available).
• You can run Mozilla Thunderbird from a removable medium such as USB stick.
• Many extensions more allow Mozilla Thunderbird to expand its feature set or improve usability.
• Mozilla Thunderbird supports Windows, Mac OS and Linux.

What's New in Thunderbird 8.0:

Homepage - http://www.mozilla.com/en-US/products/thunderbird/