Just to confirm
Our environment we only have a single mac mini that has leopard server installed. we have the media for snow leopard but i've been reading that in order for mobile access server to work you need two servers; one acting as a proxy and the 2nd being the main server inside the firewall.
SO it is possible to run mobile access server on a single server without any additional hardware while still using this single server for other duties like file server, print, etc.