From your IPhone navigate to settings menu and select Mail, Contacts, Calendars

Now fill in the following box as follows

Email: Your email address
Username : your email address
Password: your password

After verification you would be brought to this screen.

Under server box input the OWA URL

mail.caprisoffice.com

After clicking on next the setup will complete and you will be brought to what you would like to sync, after selecting what you would like to sync click on save to complete wizard.