Email Clients

• Zimbra - An open source messaging and collaboration system touting "Integrated email, calendar, documents, VoIP; "Over the air" sync to mobile devices; Microsoft Outlook, Apple, and Linux desktop compatibility; Effortless administration" The Zimbra Desktop is an alternative replacement for Microsort Outlook.
• Chandler - "Chandler is a next-generation Personal Information Manager (PIM), integrating calendar, email, contact management, task management, notes, and instant messaging functions. So far, in Chandler 0.6, we have the calendar functions experimentally usable but none of the others to the same level yet."
• Eudora - "The Paid mode commercial versions of Eudora are no longer available as of May 1st, 2007. The Sponsored mode versions of Eudora continue to be available for download. An open source version of Eudora® is being developed by Mozilla and will be free of charge."
• Evolution - "Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop."
• Evolution for Windows Finally the "Outlook Killer of the Linux World" has been ported to Windows.
• Mozilla Thunderbird - "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. On December 7, 2004, version 1.0 was released, and received over 500,000 downloads in its first three days of release, and 1,000,000 in 10 days." - Wikipedia
• OSS Watch - Open Source email clients