I was always taught that you never put a .com on your Domain name. I have always used .local. In the last few years we had a 2008 SBS that had issues with certificates. One of my colleagues wants to make our new domain a .com on the internal and external domain so he doesn't have problems with the SSL certificates that he is going to get from Godaddy. I want to use .local on the internal and .com on the external basically because I think it is safer. We will use Exchange 2010 on our network. It has a lot of auto discovery and other junk that he says will be easier to deal with having a .com on both. What says the public?