Mozilla Thunder Bird

Mozilla Thunderbird is a free, open source, cross-platform e-mail and news client developed by the Mozilla Foundation.



Features

Thunderbird aims to be a simple e-mail, newsgroup and news feed client and additional features are often available via other extensions.

Message management:
Thunderbird can manage multiple e-mail, newsgroup and news feed accounts and supports multiple identities within accounts. Features like quick search, saved search folders ("virtual folders"), advanced message filtering, message grouping, and labels help manage and find messages.

Junk filtering:
Thunderbird incorporates a Bayesian spam filter, a whitelist based on the included address book, and can also understand classifications by server-based filters such as SpamAssassin.

Extensions:
Extensions allow the addition of features through the installation of XPInstall modules (known as "XPI" or "zippy" installation). One example is Lightning, the calendar extension mentioned above.

Themes:
Thunderbird supports a variety of themes for changing its overall look and feel. These packages of CSS and image files can be downloaded from Mozilla Add-ons.

Cross-platform support:
Thunderbird runs on a wide variety of platforms like windows , mac,open solaris

Standards support:
Thunderbird supports POP and IMAP. It also supports LDAP address completion.

Security:
Thunderbird provides enterprise and government-grade security features such as SSL/TLS connections to IMAP and SMTP servers.

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http://www.mozillamessaging.com/en-US/thunderbird/