How to get list of properties of dynamic object ?

You could do this using reflection:

Type outlookType = Type.GetTypeFromProgID( "Outlook.Application" );
           dynamic outlookApp = Activator.CreateInstance( outlookType );
           foreach (var prop in outlookApp.GetType().GetProperties())
           {
               string propName = prop.Name;
               object value = prop.GetValue(outlookApp, null);
           }