The public announcement of the general availability of the first beta version of Exchange Server 2010 was followed by another exciting release: Exchange Web Services Managed API Beta.
This is actually the first fully managed API that enables easy access to mailbox through Exchange Web Services and, the cherry on top of the cake, it will also work with Exchange 2007 SP1 servers (besides Exchange Server 2010, of course).
The Microsoft Exchange Web Services (EWS) Managed API 1.0 Beta 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.