The most famous and popular software to convert the OST file to PST is known as the eSoftTools OST to PST Converter Tool. It simply repairs corrupted Outlook OST files and permits the conversion into Outlook PST and into multiple file formats with just a single mouse click. It permits users to export OST files to PST, MSG, EML, EMLX, HMTL, CSV, MBOX, etc. to access OST mailbox items with multiple email clients.
Read more:- Convert OST to PST file
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.
Hope this helps, J Wick