Active Manager
Active Manager runs as part of the Microsoft Exchange Replication Service (MSExchangeRepl, not to be confused with the Mailbox Replication Service) on every server within a DAG. Conceptually, Active Manager is the orchestrator for native-mode high availability in Exchange because it decides which database copies are active and which are passive, taking into account administrator preferences such as the database activation preference order. You can regard Active Manager as the successor of the resource management model used by previous iterations of Exchange clustering technology.
Active Manager can operate in two roles. One server in the DAG takes on the Primary Active Manager (PAM) role and the others operate in a Standby Active ...
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