I'm still trying to find Thunderbird (or something like it) for the tablets.

Seamonkey Mail looks and feels a lot like Thunderbird, because they share most of their code.

I tried setting up "Iceape" under Debian, but it kept segfaulting, and I finally gave up.

I tried setting Seamonkey up under Ubuntu, and it sorta works, but it is extremely "fragile" ... It seems like you have to close and open it every time you make a configuration change, and I've yet to actually read a message; when I click on a message in the top pane, the app closes without any errors (not even a segfault message).

So still no Mozilla-based e-mail...