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1.3 Overview

Messaging clients that implement a browsable address book need a way to communicate with an address data store in order to access and manipulate that data. This protocol enables communication between a messaging client and a data store.

This protocol is a protocol layer that uses the remote procedure call (RPC) protocol as a transport, with a series of interface methods as described in this document, that clients can use to communicate with a server. The server will use Lightweight Directory Access Protocol (LDAP) and NSPI to retrieve data that is returned to the client.

The following figure shows a graphical representation of a typical communication sequence between a messaging client and a server.

Hh354935.8184f91c-cf84-4543-bbc2-ac5627d314dd(en-us,EXCHG.80).jpg

Figure 1: Exchange Server NSPI Protocol message sequence

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