@heutger I 100% agree with you that approach should be multiple. We have now PMG (avast+clamav mailpatrol) + computers with windows defender along with webroot + not always bulletproof user firewall :)
PS: also found easy to read and understand article from webroot. they do provide free...
@heutger thanks for the link to avast offer. Just bought 2 licenses for 3 years each. I did find it the cheapest options when you have it for 3 years.
Installed on PMG 6.1-3 and it get 70% viruses now. ClamAV 30%. Looks good but human firewall works better if available :)