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The Microsoft Exchange Server 5.5 Event Service Configuration Library is implemented as a library which can be used to automate the installation of Microsoft Exchange Server 5.5 Scripting and Routing scripts.
In order to link a script to the events firing in a particular folder, an instance of this event handler (an agent) must be created in the folder. This is also known as creating a binding between an event handler and a folder. This action creates a hidden item in the folder that describes the event handler, the events to act on, and any handler-specific properties.