How configure email Professional on iPhone/iPad

From the home screen, tap Settings, then select Mail, Contacts, Calendars. 

Tap Add Account

Select  Microsoft Exchange

Bow you have to enter the data of Professional Email
In E-mail field enter your email address (eg:
In Password field enter the password you have chosen.
In Description field enter the name you want to identify the email in your device.
tap Next

In Server field enter
In Domain leave Optional (don’t’ do anything)
tap Next

Select the items you want to synchronize (basically ALL) and tap Save