Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Microsoft Password Change Notification Service (PCNS) enables synchronization of password changes in Active Directory to Microsoft Identity Integration Server Service Pack 1 (MIIS) or the Microsoft Enterprise Single Sign-On Service (ENTSSO). These components simplify password management in organizations with multiple user Digital identity repositories.The Password Change Notification filter and service components must be installed on all Domain Controllers in a Active Directory domain that is synchronizing with the configured targets. If the Password Change Notification Service is not installed and running on a domain controller, then any password changes that originate on that domain controller will not be synchronized.