The best way to convert OST to PST in Outlook 2016/2013/2010/2007 is by using the best solution eSoftTools OST to PST Converter software. This tool recovers OST mailbox items including emails, tasks, contacts, journals, calendars, etc. Also, it shows a live preview of recovered OST mailbox items you can recover and convert OST files with 100% satisfaction. This tool splits the large PST file into a small PST folder without making any changes.
Read More:- Convert Outlook OST to PST
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How to convert an OST to a PST file
Launch the Outlook application, go to File, and click Options.
Go to Advanced and click Auto Archive Settings.
Now select the number of days in which you want to run auto-archiving. Select the folder to save the archived file; also, provide the archiving options, and finally click OK.
With this, mailbox items from your OST file will be saved to the PST file as per your archiving settings.