These options work for versions 4.0, 2011, 2013 and 2015.
Different ways of connecting to your organization
The minimal requirement for synchronizing the app with the Dynamics CRM server is the Dynamics CRM web services and the authentication services availability.
You can opt for IFD with Claim-Based Authentication or, in case when the Dynamics CRM server and the Active Directory Federation Services cannot be exposed to the Internet, you can use VPN or Direct Access connection. Continue reading