Claws Mail is an email client (and news reader), based on GTK+, featuring

• Quick response
• Graceful, and sophisticated interface
• Easy configuration, intuitive operation
• Abundant features
• Extensibility
• Robustness and stability

Microsoft Outlook is a personal information manager from Microsoft, available both as a separate application as well as a part of the Microsoft Office suite.

Although often used mainly as an e-mail application, it also includes a calendar, task manager, contact manager, note taking, a journal and web browsing.

Windows Live Mail is an e-mail client from Microsoft's Windows Live set of products. It is intended to be a successor for Outlook Express on Windows XP and Windows Mail on Windows Vista. The Windows Live Mail version numbering starts at 12 because this application is an advancement of Outlook Express/Windows Mail, not an entirely new application. Windows Live Mail is developed by the same team that wrote Windows Mail.

The application is available for download via the Windows Live Essentials suite.

Mozilla Thunderbird is a free, 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.

Opera Mail—formerly known as M2—is the e-mail and news client built into the Opera internet suite. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as Atom and RSS feeds.

Opera Mail uses one database that keeps an index of all mail, and sorts the messages automatically into several "views" or accesspoints. Messages are automatically sorted by type, such as mailing lists, and mail wit...
Read more »