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Open Outlook: Ensure that Outlook is installed on your computer.
Create a New PST Data File:
Open Outlook and click on "File."
Select "Account Settings" and then "Data Files."
Click "Add" to create a new PST data file.
Give the PST file a name and choose a location to save it.
Import OST into PST:
Click "File" and select "Open & Export."
Choose "Import/Export."
Select "Export to a file" and click "Next."
Choose "Outlook Data File (.pst)" as the file type and click "Next."
Select the mailbox associated with the OST file you want to export.
Choose the PST file you created earlier as the destination.
Complete the Export: Follow the on-screen instructions to complete the export process. This will create a PST file containing the data from your OST file.