If you are developing using Exchange Web Services Managed API then now you can download @ Microsoft Exchange Web Services (EWS) Managed API 1.0
The Microsoft Exchange Web Services (EWS) Managed API 1.0 provides a managed interface for developing client applications that use Exchange Web Services. The EWS Managed API simplifies the implementation of applications that communicate with Microsoft Exchange Server 2007 Service Pack 1 (SP1) and later versions of Microsoft Exchange. Built on the Exchange Web Services SOAP protocol and Autodiscover, the EWS Managed API provides a .NET interface to EWS that is easy to learn, use, and maintain.
Moreover, If you are looking for sample application developed using Exchange Web Service Managed API then EWS Editor is a great resource to have. Read more details about EWSEditor and download it from Matt’s post @ Announcing EWSEditor 1.5! Here are the few points which I really liked about it:
1. Demonstrate the Exchange Web Services Managed API functionality and simplicity to developers through its source code. 2. Demonstrate the Exchange Web Services SOAP traffic used to perform actions initiated through an explorer user interface. 3. Assist non-developers in debugging and understanding Exchange stores by exploring items, folders, and their properties in depth. “