There isn't a lot of info out there on the OWA app for iOS. I saw a reference where the current version is supposed to work with an on premise Exchange 2013 SP1 deployment but I cannot get it working at all even when going directly to my 2013 CAS server. Has anyone be able to get this app working with an on premise deployment (no hybrid or O365).
Accessing OWA through the native browser works fine so I don't think it's an OWA issue.