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The Exchange Directory Access Layer
The computer that has the Edge Transport server role installed does not have access to the Active Directory directory service. All configuration and recipient information is stored in the Active Directory Application Mode (ADAM) directory service. To perform recipient lookup tasks, the Edge Transport server requires data that resides in Active Directory. EdgeSync is a collection of processes that are run on a computer that has the Hub Transport server role installed to establish one-way replication of recipient and configuration information from Active Directory to the ADAM instance on an Edge Transport server. The Microsoft Exchange EdgeSync service copies only the information that is required for the Edge Transport server to perform anti-spam configuration tasks and the information about the connector configuration that is required to enable end-to-end mail flow. The Microsoft Exchange EdgeSync service performs scheduled updates so that the information in ADAM remains current.
The tests mapped to this layer measure the health of the interactions between the Active Directory and the Edge Transport server.
Figure 1 : The tests mapped to the Exchange Directory Access layer
The tests associated with this test have been detailed in the following topics;