You can use the SysInspire OST to PST Converter utility to open or import things from an offline Outlook Data File (. Ost). This utility converts an OST file to a PST file without making any internal modifications (such as date, subject, or attachments). Show a live preview of the process. It's an antivirus and internet scanner that you can trust completely. It works with all Windows operating systems, including XP, 7, 8, 10, and later. If you're still not sure, you can download a free demo file that converts OST 25 items to PST files.
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I tried many OST conversion tools but didn’t get an accurate result then one of my close friends prefer me to use the SoftMails OST to PST Converter software and honestly this is the best OST to PST Converter tool ever I have tried as compared to other OST Conversion tool. This is error-free software and that can preserve all data structure or formatting through the conversion process. It will give you email filtering options which can help you to manage the all email properties like to, bcc, cc, subject, time, date, data, from, etc in just simple clicks. If you want to analyze its performance then you can use the free version of this tool from the official website of SoftMails.
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eSoftTools Best Free OST to PST Converter is a free tool that converts OST files to PST, MSG, Office 365, HTML, Yahoo, Gmail, EML, EMLX, MBOX, and VCARD Outlook files. It works for all versions of Microsoft Outlook, including version 2016. The user will be able to retrieve encrypted locked files, you can easily recover OST attachments, contacts, tasks, journals, appointments, etc.
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Convert OST to PST Manually
Open Outlook and go to the File menu.
Select the Import/Export option.
Choose Export to a file.
Select Outlook Data File (.pst)
Choose whether to export a specific folder or the whole account.
Check the Include subfolders box.
Next, select a destination for the Export, and then click Finish.