Hi, I am developing a Sync DLL in C# after I have updated the Service Pack 2 of MS Exchange Server 2003, when I issue this command it gives error "Error openning connection: 3706 Provider cannot be found. it may not be properly installed" cscript regevent.vbs add "onsave;ondelete" Alpha1.Class1 file://./backofficestorage/sentrydata.com/MBX/alpha1/eventReg.eml In REGEVENT.VBS when it tries to Register event in AddNewStoreEvent, it gives error when openning the connection. cn.Provider = "exoledb.datasource" cn.ConnectionString = strBaseUrl cn.Open If Err.Number <> 0 Then WScript.Echo "Error Opening Connection : " & Err.Number & " " & Err.Description & vbCrLf Exit Sub End If Please provide help about it. Thanks, Irfan