Microsoft SharePoint Server 2013 and Lync Server 2013 will be available with some important changes concerning External Connector licenses.
SharePoint 2010 and Lync Server 2010 on premises is licensed in the Server/Client Access License (CAL) model, which means three types of licenses:
- Client access
- External connector
With the new versions 2013, the licensing model will be simplified and the requirement for External Connectors disappears.