Interoperability is key to open source success in the enterprise applications field. Aside from the JCR (Java Content Repository) and its successor, JCR2, new standards or proposed standards are emerging, such as CMIS (Content Management Interoperability Services), that promise true interoperability between proprietary (such as Documentum, Filenet or SharePoint) and open source (such as Nuxeo and Alfresco) ECM systems. Will this standards truly unlock information from their silos and enable ECM as the backbone for unstructured information in the enterprise? Participants of this roundtable, all of them involved in various standardization efforts, will present and discuss the pros and cons of the various approaches.