You can convert your PST file to MBOX. then you can use third party software PST to MBOX Converter. This software easily convert PST files to MBOX, and other file formats such as MSG, EML, EMLX, HTML, etc. This Software supports both ANSI & UNICODE file type. PST to MBOX converter also maintains Meta properties such as (to, cc, bcc, subject, from & attachment) after convert mail no data will be change. It is compatible with all versions of MS Outlook and Windows. For more details please visit :-http://www.pstfile.org/mbox/