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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.

Really structured and useful information. And everything is clear, thanks.

I recommend going with the most valuable software Sysinfo OST to PST Converter tool for a seamless conversion of OST files to Outlook PST. This versatile software not only facilitates OST to PST conversion but also supports various other file formats, including MBOX, PDF, JSON, and many more. Furthermore, it demonstrates its capabilities by efficiently exporting OST items such as Emails, Calendars, Contacts, and Tasks to over 15 web/cloud-based popular email clients. Additionally, the utility has a number of advanced features which are pointed out below:

• The software provides the option to choose and convert either a single OST file or multiple OST files simultaneously.
• It effortlessly extracts emails, contacts, journals, tasks, and notes from an OST file and converts them into an Outlook PST file.
• This tool is fully compatible with OST files from all versions of MS Outlook and Exchange Server.
• There is a choice to eliminate duplicate emails and convert OST emails including attachment files.