The "Centralized Server Manager" is one of the server roles that is installed in a PureMessage deployment.
"Centralized Server Manager" is one of the server roles that is installed in a single-server deployment, or one of the roles that you can select for installation on a server in a custom installation. The CSM server must be the first server role that is installed. It is typically installed on the same server as the Database Server role or the Mail Filter role. See Server Deployment Options and Custom Installation. Also, see Local Services Tab for the CSM capabilities accessible from the PureMessage Manager. See also roles.