I've heard the term "BES Router" used from time to time but I don't understand what it is. I tried checking support KB articles on RIM but it still seems a little ambiguous. Can someone please clarify? Is this a service running on a Blackberry Enterprise Server? Or is this a "role"?
The BlackBerry Router is a component of the BES server. IMO you can consider it both a role and a service within BES. You can choose to "break out" the BES Router during the install to install it on a server other than the primary BES server.