i use Touchdown - Best $9.99 i've spent on Andorid.
However; needs the following - message threading
- better cut and paste from within emails and calendar.
- move to junk folder (add sender to spam list)
- better move to 'x' folder (needs to have the drop down boxes you get with outlook instead of showing all 200 of so folders i have in alphabetical order).
There are some others....but thats a good start.
What do you think? what else is missing? (and yes i still think it's the best exchange client out there though).