If you want to import Outlook OST to Office 365. You can try eSoftTools OST to Office 365 Converter software. This tool exports OST files into many formats such as PST, PST, EML,MSG, HTML with all internal data like subject, date, bcc, and many more. This tool split PST files into small PST folders and also filters the email with date and range. Users can download a free demo version and export 25 items from OST to PST format.
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