When an Exchange Server is placed in maintenance mode, administrators want to ensure that end-users are notified and emails are redirected to a alternate server or a designated mailbox to minimize downtime and prevent email loss. The "Maintenance Mode Notification and Redirect" feature provides a seamless way to notify users and redirect emails during maintenance.
Enable transport services: Set-ServerComponentState -Identity -Component HubTransport -State Active -Requester Maintenance exchange server in maintenance mode
However, in a single-server environment (common for small businesses), maintenance mode means . No email flows in or out. Calendar updates stall. Out-of-office replies fail to send. In such cases, the maintenance window becomes a critical communication event—not just an IT task. When an Exchange Server is placed in maintenance