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Installing Exchange on a ___domain controller isn't recommended [WarningInstallExchangeRolesOnDomainController]

Exchange Server 2016 or Exchange 2019 Setup has detected that the target computer is an Active Directory ___domain controller, and we don't recommend installing Exchange on ___domain controllers.

If you install Exchange on a ___domain controller, be aware of the following issues:

  • Configuring Exchange for Active Directory split permissions isn't supported. For more information about split permissions, see Understanding split permissions.

  • The Exchange Trusted Subsystem universal security group (USG) is added to the Domain Admins group. This action grants all Exchange servers ___domain administrator rights in the ___domain.

  • Exchange Server and Active Directory are both resource-intensive applications. There are performance implications when both applications are running on the same computer.

  • The ___domain controller must be a global catalog server, but Exchange services might not start correctly on a global catalog server.

  • System shutdown will take considerably longer if Exchange you didn't stop the Exchange services before you shut down or restart the server.

  • Demoting the ___domain controller to a member server isn't supported.

  • Running Exchange on a clustered node that's also an Active Directory ___domain controller isn't supported.

Therefore, we recommend that you install Exchange on a member server, not on a ___domain controller.

Having problems? Ask for help in the Exchange forums. Visit the forums at: Exchange Server.