I'm developing my first application for CRM 2011. I've imported all .dll necessary for development.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Crm.Sdk.Messages;
but when I call some simple classes like "Annotation", "Letter" , "Email", the visual studio doesn't detect these classes.
Has anybody knows why?