http://blogs.technet.com/sdoakes/archive/2006/04/12/425038.aspxImportant Update” to Exchange after adding Sp2 and IMF configuration. Be sure to keep your dat and dll files up to date. How to update the Intelligent Message Filter version 2 in Exchange Server 2003 SP2 http://support.microsoft.com/default.aspx?scid=kb;EN-US;907747en-USCommunityServer 2.1 SP1 (Build: 61025.2)