Atom TechSoft OST to PST Conversion
Use Atom TechSoft OST to PST Conversion tool to recover emails OST file into PST file format. This utility supports multiple file formats such as PST, EML, TXT, RTF, MHTML, PDF, MS Outlook , DOC, MSG, MBOX and HTML Office365, Live Exchange Server file format to restoring all the data of OST file.
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Victor Marconi commented
I also want to refer a software but this one is only for Mac OS. Use Mac OST to PST Converter which helps you to make the OST to PST Conversion done simple and also recover the damaged OST files easily. Visit here for more details:- https://www.toolscrunch.com/mac-olm-to-pst-converter.html