1) Lose the scroll bar in this client and implement kinetic scrolling throughout all of it.
2) Keep the main menu we're used to seeing in our E71 and the like that shows all of our mailboxes and the settings icon, etc.
3) Sync schedule needs to should be; Soonest, every 30 minutes, every hour, every 2 hours, every 4 hours, every 6, every 12, every 24, and how about a custom.
4) When sending an email, it should be sent immediately regardless of what the sync schedule looks like, just like the built in client does.
5) Allow copying and pasting of anything in an email. I understand that the client is going to act like every email is an HTML page, but if Apple can do it with the iPhone, you can certainly figure out how to do it too.
6) Make it work fast.