Tap Settings.

Tap Mail, Contacts, Calendars.

Tap Add Account....

Tap Microsoft Exchange.

Tap Email and key in your email address.

Tap Domain and key in the domain name.

Tap Username and key in your username for the server.

Tap Password and key in your password for the server.

Tap Description and key in a name for the email account.

Tap Next.

Tap Server and key in the required name.

Tap Next.

Tap the indicator next to the required data type to turn synchronisation of the specific data types on or off.

If you turn on synchronisation of a data type:
Tap Keep on My iPhone, Delete or Cancel.

If you select Keep on My iPhone:

Tap Keep on My iPhone.

Tap Save.

Tap the name of the Exchange email account you've just set up.

Tap Account.

Tap the indicator next to Use SSL.
Depending on the current setting, security is turned on or off.

Tap Done.

Tap the Home key to return to standby mode.