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OST to PST Converter tool, then you can take the help of Recoveryfix OST to PST Converter tool to quickly convert your single or multiple OST files with its complete data, including Emails, Attachments, Distribution lists, Contacts, Tasks, Notes, Calendars, etc., to Outlook PST. The software easily migrates OST files to Office 365, Live Exchange, Outlook.com, Gmail, and other IMAP servers.