LibPST, part of the ol2mbox project, provides functions in library form
for accessing Outlook's Personal Folders. Included with this library is
"readpst" to convert a PST file to mbox format.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
Some bugs in the MIME creation code have been fixed. Support for Compressible Encryption PST files has been added. Folder creation routines have been improved.