Thunderbird is the next generation standalone Netscape/Mozilla mail client - an excellent IMAP client and a great mailer all around.

Mozilla Thunderbird 0.2 Released Mozilla Thunderbird 0.2 is out! For those who haven't heard about it yet, Mozilla Thunderbird is mozilla.org's new standalone mail client and sister product to Mozilla Firebird. According to MozillaZine's article on the release, new features include 'a redesigned Options dialogue, spell checker improvements, enhancements to the default theme and better performance and stability'. More information can be found at the Mozilla Thunderbird Project Page and in the release notes (which include the important information that a clean install is vital). Builds are available for Windows (7.3Mb), Mac OS (11.1Mb) and Linux (9.5Mb) or you can download the source (29.1Mb) and build it yourself for extra geek points."