Excellent article that explain in details my the new Outlook app (Android and iOS) should not be used in enterprises.
Also look at the follow up post : Updates on the latest Outlook iOS App issues
Microsoft has released their iOS app “Outlook” today. And it will break your companies security for mobile PIM access in multiple ways! No matter if you’re a Microsoft Exchange or IBM Notes Traveler customer. I cannot believe that Microsoft has done what they’ve done. Even as a non-Microsoft guy I would have expected that they obey the rules of common company security rules.Read it : {rene.winkelmeyer}
Also look at the follow up post : Updates on the latest Outlook iOS App issues