Ok, im a little new at setting up Exchange Server. I have a SBS 2003 server set-up and is running Exchange just fine. I can send e-mail to everyone in my internet and recieve as well. Now I want to go public with it. In reading, I understand that there are really two ways to do this. Purchase a domain name or Dynamic DNS. What is the difference? How is using a Dynamic DNS an alternate to buying your own domain name? Could someone explain this to me a little more?..