Active Directory in Exchange Server organizations
Exchange Server 2016 and Exchange Server 2019 use Active Directory to store and share directory information with Windows. Starting with Exchange 2013, we've made some changes to how Exchange works with Active Directory. These changes are described in this topic.
Active Directory driver
The Active Directory driver is the core Microsoft Exchange component that allows Exchange services to create, modify, delete, and query for Active Directory Domain Services (AD DS) data. In Exchange 2013 and later, all access to Active Directory is done using the Active Directory driver itself. In previous versions of Exchange, DSAccess provided directory lookup services for components such as SMTP, message transfer agent (MTA), and the Exchange store.
The Active Directory driver also uses the Microsoft Exchange Active Directory Topology (MSExchangeADTopology) server, which allows the Active Directory driver to use Directory Service Access (DSAccess) topology data. This data includes the list of available domain controllers and global catalog servers that are available to handle Exchange requests. For more information about the Active Directory Driver, see Active Directory Domain Services.
Active Directory schema changes
Exchange add new attributes to the Active Directory domain service schema and also make other modifications to existing classes and attributes. For more information about Active Directory changes when you install Exchange, see Active Directory schema changes in Exchange Server.
For more information
To learn more about how Exchange stores and retrieves information in Active Directory so that you can plan for access to it, see Access to Active Directory in Exchange Server.
For more information about Active Directory forest design, see AD DS Design Guide.
To learn more about computers running Windows in an Active Directory domain and deploying Exchange 2013 or later in a domain that has a disjoint namespace, see Disjoint Namespace Scenarios.