private void StartExporter(IMailbox mailbox)
        {
            var destinationControl = MailDestination.Content as IDestinationManager;

            if (destinationControl != null)
            {
                var target = destinationControl.GetDestination(mailbox.Id);
                if (target is IMessageReader)
                {
                    var source = mailbox.GetSource();
                    source.TestOnly = TestOnlyCheckBox.IsChecked == true;
                    target.Name     = source.Name;
                    ThreadPool.QueueUserWorkItem(state =>
                    {
                        try
                        {
                            var exporter = ConnectSourceDestination(source, target);
                            mailbox.StartExporter(exporter);
                        }
                        catch (Exception ex)
                        {
                            Logger.Error("Failed to setup exporter " + source.Name, ex);
                        }
                    });
                }
            }
        }