After you enable the Intelligent Message Filter in Exchange System Manager, to enable Intelligent Message Filter updates, you must create the ContentFilterState registry entry. To do this, follow these steps:
1.Click Start, click Run, type regedit, and then click OK.
2.Expand the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange
3.In the left pane, click Exchange. Then, right-click in the right pane, point to New, and then click DWORD Value.
4.Type ContentFilterState, and then press ENTER to name the new registry entry.
5.Right-click ContentFilterState, and then click Modify.
6.In the Data value box, type 1, and then click OK.
7.Quit Registry Editor.
8.In the Services snap-in, restart the Simple Mail Transfer Protocol (SMTP) service.
By default, when the Intelligent Message Filter is installed together with Exchange Server 2003 SP2, a new folder that is named MSCFV2 is created. The Intelligent Message Filter engine and the .dat file are stored in the following location:
Drive_Letter:\Program Files\Exchsvr\Bin\MSCFV2