Outlook Mobile App is using ActiveSync for connection to on premise exchange. You have to setup the "ActiveSyncApp" in your MobileAccessBlade. Mobile Access R81.10 Administration Guide follow the instructions in "ActiveSync Applications".
If you like the OutlookApp you can use it but you can use too the internal mail applications of your phones (like mail on IOS devices), they are too using ActiveSync for connection to on premise exchange.
But, in my view Check Points capsule workspace will be the better and much more secured applications. It's running as an secured container on your mobile device and can be used in a very secured matter on any private mobile device.