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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/
January 23, 2007 Thunderbird 2.0 beta 2 has been released.
Requires a libc0.6.1 based version of the GCC runtime library. ftp://ftp.netlabs.org/pub/gcc/libc-0.6.1-csd1.zip
"Scott MacGregor writes: "Mozilla Thunderbird 2 Beta 2 is now available. Features new to Thunderbird 2 include message tags, folder views, session navigation history, a visual refresh of the theme, and improved new mail notification alerts."
Source: OS2VOICE