OST to PST import tool is useful when we are going to transfer emails, messages, contacts, calendars, appointments and other data into Outlook PST file format. By using its program, all Outlook users can simply convert OST data into several file formats such as EMLX, EML, vCal, vCard, MSG, and MBOX file format.
Transfer the offline OST mailboxes to PST in readable way, follow the easy procedure:
• Go to Files >Open & migrate and click Import & Export.
• Select conversion to a PST file; then click Next.
• Select the second option—Outlook Data File.
• choose the folder which you want to export and click Next.
More info https://www.kdetools.com/ost/de/