No doubt go with SysInspire OST to PST Converter tool for all your OST file problems. This tool is a really very excellent solution for every OST file which is created in Outlook, MS Exchange and Outlook.com. In this tool, you can convert OST file Mailbox with emails, calendars, contacts, notes, drafts, and etc and export into PST and many other formats like HTML, MSG, ICS, MBOX, vCard, Office 465, Yahoo, Gmails, and Zimbra.
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