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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.

DRS OST to PST Converter allows you to convert OST files to PST files online. It is also possible to migrate the file content to different email clients. There is less stability with OST files can be corrupted more easily. Thus, you should convert Outlook OST files to any file format. This purpose is best served by the exclusive OST to PST file converter. The tool also offers advanced features for a better user experience.

Convert OST to PST file Manually:-

Open MS Outlook.
Click the File menu.
Select the “Import and Export” wizard or press ‘t’.
From the list, click the “Export to a file” option and then click Next button
Select Personal File Folder (.pst) and then click the Next button.
Select the items to be exported or Click on parent root and check the Include sub-folders option.
Browse and select the target folder for saving the email items.
Click the Finish button.

Regards,
Peter

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Users will find the best solution for Outlook OST to PST converter software using the ToolsBaer OST to PST Conversion Tool, which has an easy graphic user interface that allows users to interact with its capabilities without any technical experience. Following installation, users will receive a free trial version of this Tool. A few offline.ost files should be converted to.pst format with this. This tool, which can be downloaded on both Mac and Windows platforms, converts OST files to PST format without the need for an Exchange server and is compatible with all versions of MS Outlook. Through this users can effortlessly solutions from .ost to .pst conversion.

Read More: https://www.toolsbaer.com/ost-to-pst-conversion/