The Microsoft Exchange User Education Team have written and published a white paper covering the Intelligent Message Filter (IMF) version 2 (v2).
Microsoft Exchange Server Intelligent Message Filter v2 helps companies reduce the amount of unsolicited commercial e-mail (UCE), also known as spam, received by users. This guide provides overall operational information to help optimize the performance of Exchange Server Intelligent Message Filter.
The first version of Intelligent Message Filter was a stand-alone tool, and is no longer supported. Version 2 of the Intelligent Message Filter, to which this Operations Guide information applies, is installed automatically with Exchange Server 2003 Service Pack 2 (SP2). For download information about SP2, see Service Pack 2 for Exchange Server 2003.
Donwload it here.