2.3.1.2 Non-RPC-Enabled Clients

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Messaging clients that are not RPC-enabled communicate with Exchange servers through MAPI extensions for HTTP, which offers the same comprehensive set of functionality as communication through RPC.

Messaging clients that are not RPC-enabled can also communicate with Exchange servers through standards-based protocols such as SMTP, POP3, and IMAP4. However, these protocols offer only standard e-mail services, such as sending and retrieving e-mail messages. More advanced features, such as contacts (2) and appointments, are usually implemented on the client rather than on the server.