In any kind of situation or problem, for one to efficiently deal with it, he has to first know or identify the problem, probably its cause before getting to deal with it. In this article we have identified computer viruses as a problem or a threat to our computers or to be specific our exchange server. We need to know what this virus is. Simply put, a computer virus is software that is malice intended to enter a computer without the owner or user’s knowledge or permission. This in turn replicates itself to harm or entirely damage the system. You must never assume a virus is harmless and ignore it. 

Before you decide on which exchange antivirus to use, you need to know the type of virus you are dealing with. Viruses are known with their different classification which in turn helps you identify the virus. The classes are based on origin, techniques, files which the virus infect, their hiding places, the damages they cause, the type of platform or operating system they attack. 

Once you use these criteria to classify the virus, you will then appropriately identify it from its class. Classes which are; logic bombs, Trojans, worms, resident, direct action, boot, overwrite, macro, companion, file allocation table, file infectors, polymorphic and directory.  Remember they all have one mission, to destroy your data. 

With that in mind, get the appropriate, spam filter exchange, the best antivirus for your situation for most viruses come from spam which originates from exchange server spam.