Microsoft France is running regular technical sessions about Interoperability.
Last December we had a session about Xcalia DAS as a generic solution for Data Access, when users have both Java and .Net client applications.
During this session Steve Sfartz introduces the new features of LinQ within Visual Studio 2008, the upcoming Entity Metadata Framework and the Microsoft vision about Data Services. He also discussed the positioning of Xcalia DAS versus Microsoft solutions.
See videos here... (all in French, sorry).