If your business has more than two servers or if you are planning on expanding anytime soon, virtualization can likely make a difference. By using a single physical server to run many virtual servers, DES can help you decrease your operational costs and get you far more bang for your buck. Rather than having to purchase new hardware to support a new business application, all you need to do is add a new virtual server.
The reasons to virtualize even a small infrastructure come down to ease of administration and cost reductions. Cost reductions come from cutting down the number of physical servers, thus reducing the power and cooling requirements, but they also come in the form of greatly reduced expansion.