OST to PST Converter App, this is the best software to export offline OST file to Outlook PST. This tool is advance utility, you can transfer OST file into PST and other many file formats such as VCF, MSG, EML, EMLX, MBOX etc. It switches all the important email elements like To, Bcc, Cc, Sent, From, Received, Attachments, etc. It also supports all Versions of Windows and MS Outlook.
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https://www.gaintools.com/ost/pst/