Remember that, if you have an Enhanced account, you can use ActiveSync, to not only sync e-mails, but also contacts and events.

Here's the step by step for setting up an IMAP account on iOS.

• Click on Settings
• Click on Mail, Contacts, Calendars
• Click on Add Account
• Click on Other
• Click on Add Mail Account
• Inform the following
  • Name - The name you want on your outgoing email
  • Email - Your full e-mail address
  • Password - Your password
  • Description - A description for your account
• Click on Next
• IMAP is selected by default
• Under Incoming Mail Server, enter as below:
  • Host Name - imap.emailarray.com
  • User Name - Your full e-mail address
  • Password - Your password
• Under Outgoing Mail Server, enter as below:
  • Host Name - smtp.emailarray.com
  • User Name - Your full e-mail address
  • Password - Your password
• Click on Next
• Click on Save