Kasunmit wrote:'Microsoft.Office.Interop.Outlook._Folders' does not contain a definition for 'Item' and no extension method 'Item' accepting a first argument of type 'Microsoft.Office.Interop.Outlook._Folders' could be found
If you read the error carefully, you will find it's not the missing assembly error. It's actually sort of wrong reference to an assembly.
To be more clear, you are trying to access certain properties/methods that are not exposed in the assembly that you have imported/referenced.
You just need to refer the correct Interope DLL, that has all those properties/methods exposed that you are trying to use.