How to setup an iPhone to use Exchange

1. Settings > Mail, Contacts, Calendars > Add Account > Microsoft Exchange.
Enter your complete email address, domain, username, password, and a description (which may be anything you like).


2. Your iOS device will try to create a secure (SSL) connection to your Exchange Server.  If it cannot do this, it will try a non-SSL connection. To override the SSL setting, go into Settings > Mail, Contacts, Calendars, select your Exchange account, tap Account Info, then toggle the Use SSL slider.
NoteAfter configuring an Exchange ActiveSync account, all existing CONTACT and CALENDAR information on the iOS device is overwritten.  Additionally, iTunes no longer sync 
CONTACT and CALENDAR with your desktop computer.