iPad 2 cannot connect to a Microsoft Exchange server with Outlook Web Access (OWA)
iOS does not use Outlook Web Access for Exchange support, it uses ActiveSync. Summarized setup instructions from this Apple support article titled iOS: Setting up Exchange ActiveSync:


Tap Settings > Mail, Contacts, Calendars > Add Account > Microsoft Exchange
Enter the information in the fields shown, then hit Next
Your iOS device will now try to locate your Exchange server. If necessary, you will need to enter your front-end Exchange server's complete address in the Server field.
Choose which content you would like to synchronize: Mail, Contacts, and Calendars. Tap Save when finished.


(See the linked support article for the screenshots provided by Apple.)