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Export mailbox as a PST file
Login to Outlook with the Exchange account that was used to create the OST files. And to export the OST mailboxes to PST, follow the simple procedure as given here:

Go to Files >Open & Export and click Import & Export.Import & Export
Select Export to a file; then click Next.Select Export to a file
Select the second option—Outlook Data File (.pst)—and click Next.Select PST file
Select the folder(s) which you want to export and click Next.Select the folder to export
Note: You have the option to include subfolders as well.

Browse the location where you want to save the new PST files and choose an option regarding the duplicate items.
Note: There is an optional choice to provide a password to the PST file, but you can easily move ahead without choosing it.

If you are exploring the most suitable OST to outlook converter software then utilizing OST to PST Converter, It can perform very well with all versions of Windows up to 10, 11 and MS Outlook 2021, 2019, 2016, 2013, & 2010. It can easily export single as well as multiple OST to PST files, without generating any problems. No restriction on the size of OST data for migration in the PST file. It can also offer a free demo for all OST users for their satisfaction in which they migrate the first few items of OST to PST files. Refer:- https://www.sametools.com/convert/ost/