Hi,

I'm using IIS 7 and has been receiving the error below when trying to open a .msg link. The error occurs only when opening .msg files. Other files such as Jpg or PDF works fine

I have tried adding the appropriate mime type entry but no success.

Any help is much appreciated.

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Server Error in '/' Application.

The application instance cannot be changed.

Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The application instance cannot be changed.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: The application instance cannot be changed.]
   System.Web.HttpContext.set_ApplicationInstance(HttpApplication value) +11162494
   System.Web.HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +46
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +392
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +263

Version Information: Microsoft .NET Framework Version:2.0.50727.4016; ASP.NET Version:2.0.50727.4016