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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 users want to transfer OST to PST I will suggest a solution with no modifications made to the original OST file, users can convert any single or numerous OST data to Outlook PST format with the ToolsCrunch OST to PST Converter Tool. It doesn't require technological expertise for users to operate its features. Users may complete the conversion process without the assistance of Outlook using this Outlook OST to PST converter, which is simple to use on both Mac and Windows platforms. Users can freely work on Windows and Mac systems to convert all Outlook version files and this application offers a free trial edition for converting a small number of OST files into PST format.

I recommend using the ToolsBaer OST to PST Conversion Tool to transfer OST to PST. It's an affordable software to transfer any version of Outlook OST file into PST format. It will ask the user for permission to choose the data store location before converting an OST file. To transfer an Outlook OST file to a PST file that includes all of your contacts, calendar events, tasks, emails, and attachments. Users will get a complete preview of the OST files. Here, users won't have to worry about losing any data when converting a sizable OST data file to PST format. All versions of Outlook are compatible with this OST to PST converter software. Install and operate this application on Windows and Mac operating systems.