[Users] arange mail as per date and not in threaded view or see unread emails only

[fachhoch m]

Can I arrange my mails like yahoo and   not in a threaded view.   If I get
reply to a mail dating lastweek the new email will be   down  along with
the  taht email thread and dows not show on top as unread email or is ther
 a way to see just unread email ?
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