[hyhconito]

Oh so some of it works offline.

Useless to me. Seriously.

I write a lot of email on planes and do a lot of email management.

All that works on the default Apple stuff as shipped other than account management. Using IMAP and iCal etc.

[NoahKAndrews]

Have you looked at their list of what doesn't work offline? It seems like it's mainly attachment management limitations than limitations of managing the emails themselves.