I was trying out a few email and calendar programs and for some reason now I can't select a default email applications in "Prefs". The only option is "Agendus Mail" which I don't like. I had it set to Chatter before and now it's not even an option. I tried deselecting and reselecting Chatter's "Make Chatter Default Email App" box but still, it doesn't appear as an option in my email apps. Is it possible that whatever file it uses to hold the available helper apps is corrupted? If so, anyone know how I can clear it out / fix it so Chatter is available in the list?