I want to suggest you eSoftTools OST to PST converter software because this software is very advanced and cool. It gives you multiple types of features that help you to convert your OST file fastly. It also converts Outlook OST file into PST and many other formats such as EML, EMLX, HTML, vCard, ICS, MSG, Zimbra, MBOX, Office 365, Gmail, and Yahoo. Download the free demo version of this tool from the official website of eSoftTools.
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