OST To PST File Software - Version 3.0 There are OST files used in organization in the presence of MS Exchange Server, but when these OST files cause corruptness cause data loss. In these OST files emails, contacts calendars, journals, to do list, etc but when dishonesty is caused to OST or Offline Storage Files then it is better to convert OST files in PST file format of MS Outlook to access OST data easily. The conversion is possible with outside application which you think is reliable for you and your need. The preventive measure is to download OST to PST file software converter freeware version. Globe Softwares has an evaluation version that is able to show all PST items at once. After get satisfactions you buy in similar price $249.