I have a client with a 403 control unit that I would like to replace with a 500. I'm uncertain on a couple of items. They have VM Pro licensed on the 403, and have two expansion modules. If I were to replace the 403 with a 500 running 5.0 what licenses would I need to add assuming I get the VM Pro license moved over to the new feature key? Can I still use the "standard to pro" license to enable expansion modules in 5.0? Do I need a prefered license in order to make VM Pro work, or is my existing VM Pro license sufficient?