I would like to suggest to you the best OST conversion tool is the PassFixer
OST to PST Converter software. This is a very advanced and cool tool for Convert OST files to PST and many other formats like EML, office 365, EMLX, HTML, Yahoo, Gmail, MSG, ICS, and vCard. And live preview feature is also inbuild into this software to help to easily convert your OST file into PST. Try the demo version of this tool from the official website of PassFixer.
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