I am getting ready to upgrade my current Exchange servers and would like to see if anyone might have some thoughts on the best pathway to do so. I currently have 2 Exchange 2010 servers in a DAG. They are running all roles on each box, there is no perimeter Edge server. I have read several docs on migrating from my 2010 DAG to a 2016 DAG but I had a couple of possible upgrades that I thought my help me lock down my environment a bit. First possibility would be to add an Edge server. If I go this route, how does that impact the migration and setup since I don’t currently have one? Does the Edge role server require a whole separate license or how does the licensing work? Microsoft can be a bit confusing on their licensing if you ask me. Or should I forget the Edge and just keep running my DAG behind the firewall with the necessary port opened up?
I'm also looking at adding a SonicWall ESA 5000. Again, not sure about implementation and whether I need the Edge server or not. I have a call into an engineer about that.