Client Access Server (CAS)
The client access server (CAS) is a server role that handles all client connections to Exchange Server
2010 and Exchange 2013. The
CAS supports all client connections to Exchange Server from Microsoft Outlook and
Outlook Web App,
as well as ActiveSync applications. The CAS also provides access to free/busy data in Exchange
calendars.
The CAS is one of five server roles in Exchange Server 2007 and Exchange 2010, and one of two
server roles in Exchange Server 2013. It must be installed in every Exchange Server organization
and on every Active
Directory (AD) site that has the Exchange mailbox server role installed. In Exchange 2007,
Outlook client connections were handled by the mailbox server.
Contributor(s): Matt Gervais
This was last updated in September 2012
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