获取outlook电子邮件C＃.net中的最顶层线程

Question

是否可以只获取Outlook电子邮件的最顶层帖子？

说电子邮件看起来像这样......

  

嗨，约翰，
                  是的，我们可以得到！我希望...

问候，   

signature_here   
  
  来自：John Doe发送时间：2015年11月4日星期三上午6:02   
要：   to@email.com   
抄送：CC@email.com   
主题：如何得到这个？   你好鲍勃，   
  什么东西

我只需要获得粗体文字。那可能吗？我收到电子邮件的代码：

        OutLook.Application oApp;
        OutLook._NameSpace oNS;
        OutLook.MAPIFolder oFolder;
        OutLook._Explorer oExp;
    try
    {
        oApp = new OutLook.Application();
        oNS = (OutLook._NameSpace)oApp.GetNamespace("MAPI");
        oFolder = oNS.GetDefaultFolder(OutLook.OlDefaultFolders.olFolderInbox);
        oExp = oFolder.GetExplorer(false);
        oNS.Logon(Missing.Value, Missing.Value, false, true);

        foreach (OutLook.MailItem mail in oFolder.Items.Restrict("[UnRead] = true"))
        {
            var subject = mail.Subject;
            var body = mail.Body; //But I only need the bolded text and not the entire thread...
            var x = mail.HTMLBody;
            var y = mail.RTFBody;
            var userName = string.Empty;
            var attachment = mail.Attachments;
            OutLook.ExchangeUser exUser = mail.Sender.GetExchangeUser();
            if (exUser != null)
            {
                userName = exUser.PrimarySmtpAddress;
            }
            else
            {
                userName = mail.SenderEmailAddress;
            }
            mail.UnRead = false;
            mail.Save();
        }
    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        oApp = null;
        oNS = null;
        oFolder = null;
        oExp = null;
    }