Stellar Converter for Mail is the ultimate Mac email conversion tool to convert mailboxes from Thunderbird (MBOX), Apple Mail (MBOX, EMLX), PostBox (MBOX), Eudora (MBOX), SeaMonkey (MBOX), Outlook 2011 Mac Backup (OLM), MailMate (EML), Outspring Mail (EML, F.EML) and Opera Mail (MBS) to Apple Mail (MBOX) and Outlook 2011 (RGE).