We've had an incredible increase in spam making it through the content filtering the last couple of weeks(Exchange 2007 sp1 edge server). The spam is being rated at SCL 2. Obviously we would never go that low in the settings. Seems like Microsoft is getting behind in recognizing new types of spam. Has anyone used Forefront - does it do a significantly better job? Any other additional spam filtering products you've found effective on top of content filtering? Up until recently, the out of the box content filtering has been doing a great job.