Converting PST & OST files to MBOX format
The challenge for many collecting institutions is that they acquire email archives in various formats, one of these is the proprietary MS Outlook PST & OST.
The challenge is the convert off-line .OST or .PST files into MBox format. Most of our attention focused on MBox, but we also did a quick evaluation of EML conversion tools.
"Apprasing OST file for restricted data
LibPST - a linux library to convert PST files to mbox
There are both open source linux tools and several commercial solutions. The right fit will depend upon the workflow. The linux solution is easily integrated into scripts. We recommend the commercial solutions, with caution, if a conversion to MBox (or EML) format is required and the user needs a friendly GUI or doesn't have access to linux.