General Scheduling error
When you try to create a new appointment, It shows the error message "General Scheduling error" . If trace is enabled, the below error is recorded in the trace. "Inner Exception: System.Data.SqlClient.SqlException: Violation of UNIQUE KEY constraint 'UQ_PrincipalObjectAccess'. Cannot insert duplicate key in object 'dbo.PrincipalObjectAccess'." The solution for this is to install the hotfix . http://support.microsoft.com/kb/956129 In our case, the above hotfix has resolved the issue.