I am running a small business and have been using an IT consultant for about 3 or 4 years now. He has preached Linux and SCO to us from day 1. My business has now decided to go the Microsoft route and get Microsoft stuff for our server and computer network. We have also hired a new IT consultant. I have not yet told the old IT consultant of this. What's the best way to go about basically telling this guy that we no longer need his services without sounding like a-holes?