Providing software-as-a-service to a plurality of clients includes: visually rendering a first virtual portal and a set of portal resources according to a portal-resource association specified in a resource association matrix; identifying a set of server resources accessible from a portal server, the set of server resources excluding the set of portal resources; determining a score for a first resource of the set of server resources; visually rendering the first resource; and associating the first resource with the first virtual portal in the resource association matrix by adding an identifier of the scored resource.