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There is trusted software available, such as eSoftTools OST to Office 365 Migration Tool, which imports OST files to Office 365. With this program, you can convert all of your OST emails, attachments, contacts, calendar, journals, tasks, notes, and more. Also, you can save OST into PST, EML, EMLX, Gmail, Zimbra, HTML, MBOX, CSV, and vCard formats.

Get More Info:- Best OST to PST Converter Tool