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"Thunderbird is a full-featured email, RSS and newsgroup client that makes emailing safer, faster and easier than ever before."
http://www.mozilla.org/ports/os2/
December 23, 2006 Thunderbird 1.5.0.9 has been released.
Zipfile: http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/1.5.0.9/contrib/thunderbird-1.5.0.9.en-US.os2.zip
Release Notes: http://www.mozilla.com/thunderbird/releases/1.5.0.9.html
Here's what's new in Thunderbird 1.5.0.9:
* Improvements to product stability.
* Several security fixes.
Requires a libc0.5.0.1 based version of the GCC runtime library.
http://www.innotek.de/index.php?option=com_content&task=view&id=23&Itemid=40&limit=1&limitstart=2
Source: OS2VOICE