Apparently that's possible with Thunderbird: http://kb.mozillazine.org/Sharing_a_profile_between_Windows_and_Linux http://kb.mozillazine.org/Sharing_a_profile_b

Apparently that's possible with Thunderbird: http://kb.mozillazine.org/Sharing_a_profile_between_Windows_and_Linux http://kb.mozillazine.org/Sharing_a_profile_between_Windows_... I think there aren't many more cross platform alternatives available anyway.