I have removed our original Exchange 2013 CAS server from the virtual server section and replaced it with a new Exchange 2013 CAS server, all works fine. As soon as I delete the original Exchange 2013 CAS server from the 'server' section, I am no longer able to add/delete/modify any mailboxes, error messages are generated. What is the recommended path for removing Exchange servers from SolidCP while keeping the control panel working?