Today is a new release of Thunderbird emailing solution from the mozilla project team.
Thunderbird delivers. Enjoy safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views. Brought to you by Mozilla, Thunderbird makes email better.
With extensions you can download mail from servers that give you free email but want you to pay to access you emails via other desktop applications.
Thunderbird home page (N:B it still displays version 1.5) http://www.mozilla.com/en-US/thunderbird/
New improved version can be downloaded via this link: http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/2.0.0.0/win32/en-US/Thunderbird%20Setup%202.0.0.0.exe
Note that if you rely on AOL/Netscape mail, then don't install this new version as there are no extensions ready for AOL/Netscape mail.