To a great extent it's working great and with exchange 2010 to confirm that question!
- Better exchange calendar integration i.e. I receive a meeting request, I can accept it and it subsequently add's it to my calendar (device and exchange) and sends a response to the meeting organizer. - Unread email count on mailbox screen (maybe a counter next to the title) - Fewer steps to get to inbox. E.g. launch email>selecmailbox>go directly to inbox and skip folders. The palm pre does this very well and it's quite useful - Autoload of images - Different color for priority mail (e.g. make the email red in the inbox)