If you wondering to change or export Apple Mail, Thunderbird, Spicebird, LiveMail, Mulberry, OperaMail, SeaMonkey, MozillaMail, Entourage, Pocomail, Eudora, Netscape, Evolution, Sylpheed, ClawsMail, etc. email client applications saved MBOX email file in MS Outlook PST, MSG, EML, RTF and in HTML...