If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
we are currently running SAP ERP ECC 6 and we are planning to go for ESS. while implementation we should go for ESS and ERP on same physical server with different virtual server or with seperate physical server for ERP and ESS