The typical use case for this tool is when an organization disables an employee's Exchange account or if you're no longer able to connect to your Exchange server. Without access to the server, the OST file remains locked and unreadable by Outlook, but a converter can still extract and export all your mailbox data, including emails, contacts, calendars, tasks, and journals, into a usable PST format. Once converted, this PST file can be seamlessly re-imported into Microsoft Outlook.
That being said, if you're looking for a reliable and legitimate solution to convert OST files to PST, I can suggest some alternatives: stellar ost to pst converter 5.0 full crack