I wouldn't recommend combining this server with your antivirus/antithreat management server and your backup server since you are also allowing access to end-user computers. However, if you are not managing mobile devices that are internet-connected, then it could be argued that things are secure enough on the internal wireless network.
Your MMS server will need to bind an HTTPS certificate on a port, typically 443, but this is flexible, in order to communicate with end-user devices.