Microsoft Outlook Web Access allows users to access Outlook email to and from the Internet. It has a similar format to the Outlook email client except it is Web-based. OWA is administered through the Microsoft Exchange server. Once you have set up your account, you will have access through a user name and password you have created. With the iPhone, you have the ability to set up email and even though you can access OWA through the Web, you can still sync its data to your iPhone.
Tap "Settings," "Mail, Contacts and Calendar" on your iPhone.
Tap "Add Account." Select "Microsoft Exchange" as the server.
Type your OWA email address when prompted, as well as the Outlook Web Access server user name and password. Your OWA account will sync with your iPhone.