We are running a cluster of Zimbra 7 servers and are starting to migrate to Zimbra 8. Our staff and clients currently use the Zimbra 7 admin interface for all administrative issues. Since the Zimbra 8 interface is a bit different from 7, we would like to continue to use the 7 admin interface for now. Is it possible to configure the cluster to use the Zimbra 7 admin page to manage both 7 & 8?