> So, I'm curious, is there anything out there that takes the good
> features of these programs (calendaring and other `groupware' 
> features)
> and integrates a solid e-mail system that won't lock you in to a
> particular platform?  I suppose I'm dreaming to think there's a
> possibility...

Pickins are pretty slim.  HP Open mail, now abandonware, picked up by
someone looked pretty good.  It seems to me that no one on the *nix side
of things has put together a powerful email/scheduling/groupware app.  

IPC 2002