I have question for those who say a av program is not needed. How will you protect you users from going to a infected web site. I have seen this on web designers in my company and with associates of mine.Ex: Say the president of the company wants to check out a porn web site on screwing chickens. He or she goes on and gets popups and redirects and never knows that they are now infected with a bloodhound worm. It is not a stretch to go and put a mass mailer on the same site and you will be a new zombie spewing out email and will not know for hours/days till the bandwidth loss is noticed. Just my 2 bits.