You can utilize the OST to Outlook Converter tool which can transfer OST files into MS Outlook PST file format. The converted files can be move on any edition of MS Outlook application including MS Outlook 2019, 2016, 2013, 2010, and other released editions of MS Outlook. It can maintain the elements of all selected OST files along with all attachments and other text and non-text items.

export the OST mailboxes to PST, follow the simple procedure:

Go to Files >Open & Export and click Import & Export.

Select Export to a file; then click Next.

Select the second optionOutlook Data File.

Select the folder which you want to export and click Next.


https://www.kdetools.com/ost/fr/