title: Is it possible to build any application without Azure Active Directory involvement for Office 365 REST API?
body: <p>Is it possible to build any application (console, windows store, WPF, MVC, Web API, Android, iOS etc.) that consumes the Office 365 REST API without Azure Active Directory involvement?</p>
  
  <p>So far that does not seem possible without Azure Active Directory.
  But there are many app on Windows, Android and Applet app store that can be connected to Office 365 and pull the user contacts. So how do they do that?</p>