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The commands specified by this protocol are sent to and
received from the server by using the underlying ROP request buffers
response buffers, respectively, as specified in [MS-OXCROPS].
Asynchronous calls are made on the server by using RPC
transport, as specified in [MS-OXCRPC],
and the MAPI extensions to HTTP<1>, as specified in [MS-OXCMAPIHTTP].
are sent from server to client by using the User Datagram Protocol (UDP), as
specified in [RFC768]. For
more information, see [MSDN-WS2].