The combination of a Team System solution, including a BizTalk project and an Unit Test C# project is not a good one, as I learned recently. ;-) The problem occured, when I wanted to add a BizTalk map in an orchestration - simply nothing happened. The only thing was an bunch of errors while closing Visual Studio afterwards: --------------------------- Microsoft Visual Studio --------------------------- Unexpected error encountered. It is recommended that you restart the application as soon as possible....