How to Convert Emails From OST to PST in Outlook?
Now it is quiet simple and easy to convert OST files to PST format using powerful EmailsGuru OST to PST Converter tool. It is recommended tool by many IT professionals and Outlook users to convert OST files to PST format including emails, contacts, calendars, notes and all other items. It is capable to convert any size, corrupted or damaged OST files to PST format without any data loss. It is fully supportable to all versions of Microsoft Outlook and Windows Operating Systems.
Visit here- https://www.emailsguru.com/ost/pst/

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jax smith commented
Use MacMister Mac OST Converter to directly convert emails from OST to PST in Outlook along with attachments, emails, contacts, tasks, and other data items. The tool enables users to import unlimited OST files to PST files at once without altering the folder hierarchy. One can also use other output formats to transfer OST files, like PDF, EML, MSG, MBOX, HTML, CSV, DOC, Gmail, Thunderbird, Office 365, etc. Check out the free trial pack of the program and understand the whole process of importing Mac OST files into Outlook PST format.
Visit here- https://www.macmister.com/ost/