Q. What are application partitions? When do I use them?

A1) Application Directory Partition is a partition space in Active Directory which an application can use to store that application specific data. This partition is then replicated only to some specific domain controllers.The application directory partition can contain any type of data except security principles (users, computers, groups).**A2) These are specific to Windows Server 2003 domains. An application directory partition is a directory partition that is replicated only to specific domain controllers. A domain controller that participates in the replication of a particular application directory partition hosts a replica of that partition. Only domain controllers running Windows Server 2003 can host a replica of an application directory partition.