Download a free trial version of Professional OST to Office 365 Migration tool to know step by step working of OST to Office 365 Migration tool. Through the full version of this tool, Outlook users can import corrupted and non-corrupted OST files into Office 365, Live Exchange Server, Outlook Profile Stores, PST, EML, and MSG. It also lets the users save OST to HTML, RTF, Cal, vCal, and vCard format.
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for quick conversion result try sifo ost to pst converter software to convert all ost mailbox items in to pst file this software is convert all ost mailbox items like emails, contacts, calendars, notes, task and many other items in to pst file this software support all version 32bit and 64bit ost file an convert corrupted and unmounted ost file. for more info visit this link https://www.sifosystems.com/ost-to-pst.php