When receiving a cancellation, you cannot 'remove from calendar' -- a feature WM has on the mobile.

Font formatting and general email formatting is messed up on replies. Things look strange in Outlook (font is Times New Roman)

When clicking on a person's name in an email (To/CC) there should be an option to look them up in the Exchange Directory so you can get their Office Location and Phone Number

Outlook 2007 allows you to catagorizes mail items (in cluding Calendar) and to colour code these.

Supporting this on the iphone would be great

Come 'on now. How many web pages become completely useless in Safari without Flash.

Google currently supports Exchange ActiveSync for contacts and calendars, and they'll probably add support for push email soon. It would be really nice to be able to use a corporate Exchange account and a push gmail account on the same iPhone.

No way to decline/approve/tentative without sending response...this is an Outlook/WM feature that is great, being able to accept but not send a response.

The ability to "reply to all" to a appointment, the main scenario is when you are running late to a meeting and you want to let everyone know.

I really don't want to hear notifications at 3am. I need to have a real scheduler like in Windows Mobile or Blackberry. I need ability to turn of push/fetch per mail account at given time range.

Currently you are taken to next message, but you should be given option to go back to inbox view.

When viewing contacts in the Exchange directory, you cannot 'Add to Contacts' to add the contact to your local storage.

Some calendar entries will truncate if they have extended amounts of text. It would be great to stop this as it also corrupts the entry on the Exchange server.