Professional ASP.NET MVC 1.0 (Wrox Programmer to Programmer)

System. DirectoryServices

Classes that provide access to the active directory.

System. EnterpriseServices

Classes that are used to manage component activation and associated activities in an enterprise scenario.

System.Messaging

Classes for working with message queues, sending messages to queues, and receiving or peeking messages from queues. Note that this is not used for SMTP messaging.