Don't worry if you don't know how to convert pst files to mbox format. I'm going to recommend software that will quickly convert the PST file to an MBOX file. Its name is eSoftTools PST to MBOX Converter Software . I have used the PST to MBOX Converter application for more than a year and it still provides the proper results. All users have a demo edition. Technical support is available 24x7 service.