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.
SAP CRM had its own middleware component which handles bDOC (Business DOcuments) for messaging. Will it be replaced using Exchange Infrasturcture? If it is so, from which version of CRM it will happen and which version of XI will be used?