The best approach for convert OST to PST file format is eSoftTools OST to PST converter tool. This tool will support you in convert all elements such as addresses, journals, assignments, attachments, Meta properties, and other things of OST files into PST or required file formats like MBOX, HTML, EML, EMLX, etc without any changes in its original data.
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stella ost to pst recovery software is the best software to recover all ost file data in to pst file this software is recover all corrupted and unmounted ost mailbox items in to pst file this software is support all version 32bit and 64bit ost file this software is recover all ost items like emails, contacts, calendars, task, notes and many other items in to pst file. for more info visit this link https://www.stelladatarecovery.com/ost-to-pst-converter.html