To transition the client access namespace to Exchange Server 2019, change the DNS record for the client access namespace to the Exchange Server 2019 environment.
Testing the client access namespaces after configuring them ensures clients can connect to the Exchange Server 2019 services without issues.
Configuring the client access namespaces ensures clients can connect to Exchange Server 2019 using the correct URLs for each service. They help to ensure a smooth user experience and avoid issues such as certificate errors and connection failures.
The Autodiscover service connection point (SCP) provides information to domain-joined Outlook clients on connecting to the Autodiscover service for automatic client configuration.