For what it's worth, I'm blocking all critical vulnerabilities, critical/high spyware, and all viruses. In the last week I blocked 100 vulnerabilities, 700 instances of viruses, and 900 instances of spyware. I used the built in custom reports to get this data out of the firewall. However, I haven't gotten as many phone calls as I would have expected. I usually only get a couple of phone calls every month. That said, I am just scanning for spyware, viruses, and vulnerabilities. I have not blocked any of the confirmed spyware via URL filtering.
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