Changing the Exchange Service Account Password

Because all Exchange Server computers within a site use the same service account password, you must synchronize the password change among those machines. Otherwise, you might experience problems such as failed deliveries, stalled directory replication, or a complete cessation of the service (which requires a full restore of all systems from your last backup).

Fortunately, Microsoft provides the Exchange Administrator utility to change the service account password. Accessing the utility is straightforward:

Exchange Administrator records any errors in the event log. You must perform this procedure on each site where you need to change the password.