Planning for the Client Access Server Role

The CAS role in Exchange is the role that controls access to mailboxes from all clients. It is the component that controls access to mailboxes via the following mechanisms:

• MAPI on the Middle Tier (MoMT)

• Outlook Web Access (OWA)

• Exchange ActiveSync

• Outlook Anywhere (formerly RPC over HTTP)

• Post Office Protocol (POP3)

• Interactive Mail Access Protocol (IMAP4)

In addition, CAS servers also handle the following two special services in an Exchange topology:

Autodiscover Service— The Autodiscover Service allows clients to determine their synchronization settings (such as mailbox server and so on) by entering in their SMTP address and their credentials. It is supported across standard HTTPS connections.

Availability Service— The Availability Service is the replacement for Free/Busy functionality in Exchange 2000/2003. It is responsible for making a user’s calendar availability visible to other users making meeting requests.

Client access servers in Exchange 2010 are the replacement for Exchange 2000/2003 front-end servers, but include additional functionality above and beyond what front-end servers performed. In addition, one major difference between the two types of servers is that client access servers in Exchange 2010 communicate via fast RPC between themselves and mailbox servers. Exchange 2000/2003 servers used unencrypted HTTP to communicate between the systems.

Note

In addition to providing for HTTP access to Exchange data, CAS servers fulfill an important role with regard to SharePoint. They provide for a direct link to SharePoint sites via the OWA interface.

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