[a33ik]

ICrmService service = context.CreateCrmService(true);

Необходимо поменять на

            CrmAuthenticationToken token = new CrmAuthenticationToken();
            token.AuthenticationType = AuthenticationType.AD;
            token.OrganizationName = context.OrganizationName;

            CrmService service = new CrmService();
            service.UseDefaultCredentials = true;
            service.Url = (string)(Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\MSCRM").GetValue("ServerUrl")) + "/2007/crmservice.asmx";
            service.CrmAuthenticationTokenValue = token;