To convert OST file to PST, I recommend using an automated approach over Manual ways. In automated method, conversion of OST to PST happens using a third-party tool. I prefer a reliable utility named OST to PST Converter Tool. It is the safest tool that
lets users convert OST files to various file formats without losing any data. It converts OST to PST, EML, PDF, MSG, MBOX, EMLX,etc. It also helps users migrate OST files to Gmail, Yahoo Mail, Office 365, Thunderbird, Opera Mail, IMAP, email clients.It
also provides trial version that convers 50 emails for free. To know more:
https://www.convertertools.org/convert/ost/pst/
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