Using the Exchange Web Services Managed API
The Microsoft Exchange Web Services (EWS) Managed API provides an intuitive interface for developing client applications that use Exchange Web Services. The EWS Managed API provides unified access to Microsoft Exchange Server resources, while using Microsoft Office Outlook–compatible business logic. The EWS Managed API communicates with the Exchange Client Access server by means of EWS SOAP messages.
For Exchange 2010 and later versions, we strongly recommend that you use the EWS Managed API instead of auto-generated proxies for developing against Exchange Web Services. The EWS Managed API object model is significantly easier to use than auto-generated proxy object models.
For more information about the EWS Managed API, see the Microsoft Exchange Web Services Managed API 1.0 SDK.