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If you plan to use the advanced security features of Microsoft Exchange Server, configure only one server in your organization to store and manage the advanced security database. This server is known as the Key Management (KM) server.
When configuring the KM server, consider the following:
For maximum security, configure your KM server as a dedicated server in a separate site. The load on the KM server is negligible because the server is primarily used for generating keys, which is done infrequently.