The finest offer from SysInspire goes with this OST to PST Converter Software, which enables to safely recover OST data and convert OST files into PST files, among other things. HTML, EMLX, EML, MSG, Yahoo, Zimbra, Gmail, MBOX, and Office 365 are all examples of email formats. It works with all versions of Microsoft Outlook, including 2010, 2007, 2013, and 2016.
Read More:- Convert OST File to PST
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.
This may help, Jimmy Wick