Microsoft.Office.Interop.Outlook.Application app;
   Microsoft.Office.Interop.Outlook.Items items;
   Microsoft.Office.Interop.Outlook.NameSpace ns;
   Microsoft.Office.Interop.Outlook.MAPIFolder inbox;

   Microsoft.Office.Interop.Outlook.Application application = new Microsoft.Office.Interop.Outlook.Application();
   app = application;
   ns = application.Session;
   inbox = ns.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox);
   items = inbox.Items;
   foreach (var item in items)
   {
    var mail = item as Microsoft.Office.Interop.Outlook.MailItem;

    if (mail != null)
    {
     if (mail.UnRead == false)
     {
      Globals.Ribbons.Ribbon1.txtHwabInfo.Text = mail.SenderEmailAddress;
     }
    }
   }