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Searching for the best and most expert way to convert OST files to PST is Enstella OST to PST Recovery Software and many conversion formats like OST to PST, EML, MSG, HTML, MBOX, vCard, and EMLX and inner mailbox items such as emails, contacts, attachments, images, journals, tasks, calendars, distribution lists, draft folders, etc. This software has an additional feature every year updation of without price, Lifetime license validity, and premium technical support. Can you use these multiple features for users. Enstella is Windows-based software that works only on Windows Systems. 

More info- Exporting OST file to PST