get selection in a mailItem Body(MS Outlook 2007) VSTO C#

Outlook.Application myApplication = Globals.ThisAddIn.Application;
           Outlook.Explorer myActiveExplorer = (Outlook.Explorer)myApplication.ActiveExplorer();

           Outlook.Selection selection = myActiveExplorer.Selection;

           if (selection.Count == 1 && selection[1] is Outlook.MailItem)
           {
               Outlook.MailItem mail = (Outlook.MailItem)selection[1];

               mail.Copy(); // currently opened mail

               Outlook.MailItem mailItem = (Outlook.MailItem)
              myApplication.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem);

               mailItem.Subject = mail.Subject;
               mailItem.To = mail.To;

               mailItem.Body = ?????      // copy only selected text/images of user

               mailItem.Importance = Outlook.OlImportance.olImportanceLow;
               mailItem.Display(true);
           }