To help you set up your Apple device for Email and Calendar, we've made the following instructions. There are other ways to connect but each one has advantages and disadvantages. If you get stuck, please have a look at our troubleshooting section.
Why exchange? Have a look at our FAQ for more information.
If you recieve a message saying "What would you like to do with existing local contacts/calendar entries" make sure to select Keep on my iPhone/iPad failiure to do this will delete your phonebook/other calendars.
If the mobile team is asked a question relatively often, we'll try and update our FAQ page. Take a look and if there is anything missing, please let us know!