Microsoft Exchange Server 2007 uses Web ServicesA Web Service is an application available on the Web that other applications can share, regardless of the platform and the language that the applications use. Other application developers can subscribe to the Web Service without having to implement the code themselves. This is because of the open standards that Web Services support, such as XML, Simple Object Access Protocol (SOAP), Web Service Description Language (WSDL), and Universal Description, Discovery and Integration (UDDI). as the primary protocol for interacting with the server running Exchange Server. Exchange Web Services represents the future of how clients use Exchange Server. Microsoft Entourage 2004 for Mac and Microsoft Entourage 2008 for Mac use the WebDAV(Also known as WebDAV). World Wide Web Distributed Authoring and Versioning. An Internet protocol that is used by Entourage and Outlook Web Access to communicate with an Exchange server. protocol. To take advantage of the latest innovations that Exchange 2007 has to offer, Microsoft Entourage 2008 for Mac, Web Services Edition, uses Exchange Web Services for all communications with the Exchange server.

Compared to WebDAV, Exchange Web Services offers a more robust feature set to enable client applications to communicate with the Exchange server. Entourage 2008 used Exchange Web Services functionality to support Free/Busy, Out of Office Assistant, delegation, and Autodiscover service features. For more information about these features, see What's new for the IT professional in the Microsoft Office 2008 for Mac Administrator's Guide. In Entourage 2008, Web Services Edition, Exchange Web Services provides folder and item synchronization, notes, tasks, and categories synchronization with the Exchange server and includes several calendaring improvements. For more information about the list of new features, see New features in Entourage 2008, Web Services Edition.