How to Migrate OST to PST Files - Version 3.0 Want to know how to migrate OST to PST files? This process becomes easy with SysTools OST to PST Software. OST file represents a copy of your MS Exchange mailbox, which is stored in your HDD (hard disk drive). OST files are very important because they allow speeding up your work with Exchange server, when you are logged in. You can use offline folders in Outlook and convert ost to pst file with our magnificent OST2PST Converter tool. Software easily migrate Outlook OST to PST in any storage media and extract data from encrypted OST files. With the using of OST to PST software you can convert all items of OST file like emails, journals, calendar, notes, tasks, contacts & attachments etc to PST file (Personal Storage Table) or move any items from OST file to PST. Software easily exports all OST email properties such as sender's name, recipient's name, subject, message flags, creation date/time, etc to PST and helps you to get back deleted emails from "deleted items" folder of OST file and restore original formatting of RTF and HTML. So you can easily and