You can try this MBOX to PST Converter tool to Migrate & Convert MBOX to PST file format. It capable to export MBOX database in Outlook from almost 20+ email clients such as Entourage, Thunderbird, Pocomail, Spicebird, AppleMail, Mulberry, Eudora, Netscape, SeaMonkey, OperaMail, ClawsMail, Evolution, Mozilla Mail, Cone, etc. The software provides a free demo version for the user that export first 30 MBOX emails from each folder to Outlook PST Format.