CNS understands the negative impact that a virus, malware and spam can create in an organization.  As such we offer a very unique layered design to control viruses, maleware and spam.  We use technologies from Juniper, Barracuda and ESET to accomplish this layered protection approach.  We also use best practices recommended by Microsoft to protect your Exchange environment whether you are a single server or a clustered environment with front-end and back-end servers.  NOD32 offers a great antivirus product that has a small footbprint in memory, fast scanning, frequent updates and advanced heuristic engine to find new viruses in the wild before they become a problem.