To sync Exchange email to your iPhone device:

Step 1. Select the Settings icon on the iPhone.
iPhone Settings Icon


Step 2. Select the Mail, Contacts, Calendars section.
iPhone Settings Panel highlighting the Mail, Contacts, Calendars category


Step 3. Choose Add Account
IPhone Mail, Contacts, Calendar Settings Panel highlighting the Add Account.... button


Step 4. Select the Microsoft Exchange as account type
iPhone Add Account Panel highlighting the Microsoft Exchange option


Step 5.  Enter Email, Username and Password.  Server is
Domain is AD. Description is Exchange. Use SSL should be switched to ON. S/MIME should be
switched to OFF.
When finished select Done at the right top.
iPhone Account Panel showing highlighted fields.


Step 6. Select the Save button at the top right.
iPhone Exchange panel.