claws-mail =) The only mobile email solution that meets my needs (multiple POP accounts + heavy filtering). There is nothing close on android. claw-mail is one of the strongest reasons to keep my n810 & n900 running.

claw's address book? I never use it, I looked into it a long time ago, but I just don't need it.

With just some minor path tweaking you can move all of claws settings/filters between devices. I setup my Ubuntu netbook's claw-mail with copied files from my n900 =D

Exporting from Outlook? Terrible, at least as of 2004. Totally "Hotel California"/"Roach Motel".