Custom IMF weighting

IMF (Intelligent Message Filter) has its flaws, but it's free. Instead of rewriting all the steps, here is an excellent guide on IMF custom weighting:

http://www.msexchange.org/tutorials/Intelligent-Message-Filter-version-2-IMF-v2.html

Of note - it's possible I've never done this right until today, when I saw that you need to do this to make custom weighting work properly:

regsvr32 Drive_letter:\Program Files\Exchsrvr\bin\MSCFV2\MSExchange.UceContentFilter.dll

Also - it's CRUCIAL that you save the XML file as type Unicode and not ANSI. Afterward, restart the SMTP service.