Mozillazine (http://www.mozillazine.org) posted this news a little while ago.
Minotaur (http://www.mozilla.org/mailnews/minotaur/m...ur-roadmap.html), the Mail/News client branched from Mozilla, has builds released for Win32, MacOSX, and Linux platforms. The Win32 build was just recently updated using trunk code from current Mozilla builds, and the other platforms have a client using 1.3a Mozilla Mail/News code.
The goal of Minotaur is to break off completely and form a stand-along Mail/News client based off Gecko and utilizing the Mozilla GRE. More information can be found at the above links. Download link provided below.