Favored Freeware: Thunderbird
Thunderbird is a simple to use, powerful, full-featured, and customizable email application. Thunderbird supports IMAP and POP mail protocols, as well as HTML mail formatting. Easily import your existing email accounts and messages. Built-in RSS capabilities, powerful quick search, spell check as you type, global inbox, deleting attachments and advanced message filtering round out Thunderbird’s modern feature set.
Pros: Thunderbird is easily expandable and has a large and fast-growing user base (mostly Outlook Express refugees). Thunderbird is a cross-platform email application for Mac, Windows, and Linux.
Cons: None significant.
Note: Featured in Secure Your Email and Current Mozilla Foundation Projects.
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Personally I prefer Mail.app. Tried Thunderbird once and it dumped all of my useful emails into the Junk folder.
Which version was that? I only began heavily using Thunderbird when it hit v1 and haven’t had any problems yet.