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. ...
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