Hallo NG, I hope that is the right newsgroup I have an VB.NET application that open an email and read some user properties. By reading one of the user property I get the exception "HERSULT:0x80020005 (DISP_E-TYPEMISMATCH)". In my developer and test area (that is an vm-system) my application works realy fine. All my user properties will reading by my application. Both systems are the same configuration (Win2003 server with sp2 and .Net framework 2) Can anyone explain me the error message? many thanks , Thomas