http://developers.de/blogs/damir_dobric/archive/2016/05/24/aad-authentication-with-rest-api-client.aspxIf you have ever worked with SOAP, it is most likely that you have get in touch with WSDL, which is used to generate service proxy code on the client side. In the meantime REST became more popular, but many SOAP established features were not availableenCommunityServer 2008 SP1 (Build: 30619.63)