The Exchange 2010 Web Services SDK includes the following sections:

• What's New – Summarizes changes that have been added to this release of the Exchange 2010 Web Services SDK.
  
• Introduction to Web Services – Introduces the development technologies and features that Exchange 2010 provides for client access to Exchange store items.
  
• Web Services Concepts – Describes the underlying concepts and mechanisms that are needed to create client applications that work with Exchange 2010.
  
• Working with Autodiscover – Provides information about how to use the Autodiscover service in Exchange 2010.
  
• Working with Exchange Web Services – Provides information about how to use Exchange Web Services in Exchange 2010 to perform specific tasks.
  
• Web Services Development Solutions – Describes functional sample applications that use Web services in Exchange 2010.
  
• Reference – Provides detailed information about the Web services APIs that are included in Exchange 2010.
  

Exchange 2010 introduces the following important changes that might affect your Web services–based applications:

• Several new features have been added to Exchange Web Services (EWS), including operations related to the following: user configuration, mail tips, message tracking, calendar and contact sharing, room availability, time zones, service configuration, and Unified Messaging.
  
• A new SOAP-based Autodiscover service has been introduced as an alternative to using the “plain old XML” (POX) Autodiscover service.
  
• Exchange Web Services (EWS) has been updated to include Unified Messaging functionality. You no longer have to use the separate Unified Messaging Web service (nor do we recommend this).
  

For more information about these and other changes, see Introduction to Web Services.

Some development technologies that shipped in earlier versions of Exchange Server are not included in Exchange 2010.

The following technologies were removed from Exchange 2007:

• Exchange providers for Windows Management Instrumentation (WMI)
  
• Collaboration Data Objects for Exchange Management (CDOEXM)
  
• Collaboration Data Objects for Exchange Workflow (CDOWF)
  
• Exchange Web Forms
  
• At Functions
  
• DAPI.DLL
  

The following technologies were removed from Exchange 2010:

• Exchange OLE DB Provider (ExOLEDB)
  
• Exchange store Event Sinks
  
• World Wide Web Distributed Authoring and Versioning (WebDAV)
  
• CDO 3.0 (CDOEx)
  
• Item-level permissions
  
• Exchange Store custom item types
  

These technologies are not documented in the Exchange 2010 Web Services SDK. Any references to these technologies in the documentation are in error. For migration information, see the Guide to Exchange Server 2010 Development Technologies.