I think eSoftTools OST to PST Converter software is able to convert OST to PST without Outlook and convert your large-size OST file into PST. This tool provides many types of helpful and useful features that help you to convert Outlook OST safely and fastly. It’s able to convert outlook OST files into PST and many other formats such as EML, HTML, Yahoo, Gmail, office 365, HTML, ICS, Zimbra, MBOX, EMLX, and vCard. Bulk conversion and email filtering like the most helpful feature are also available in this tool. Check the free demo version of this tool from the official website of eSoftTools.
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