Convert any type of OST file to Outlook PST with OST to PST Conversion Software. Which enables the user to export all OST items like emails, contacts, chats, tasks, notes, journals, and appointments to multiple file formats such as- PST, EML/EMLX, MSG, and HTML. The software comes with a simple GUI which is another one feature of this OST to PST Tool to simply make the conversion of OST file to Outlook PST. You can also try a free demo version of this software to convert 10 items from every folder of OST file to Outlook PST.
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https://www.completeconverter.com/ost/