Open Outlook:
Launch Microsoft Outlook on your computer.
Go to File:
Click on "File" in the top-left corner.
Open & Export:
Select "Open & Export" and then choose "Import/Export."
Choose Export to a File:
Select "Export to a file" and click "Next."
Choose Outlook Data File (.pst):
Choose "Outlook Data File (.pst)" and click "Next."
Select the OST File:
Select the OST file you want to export.
Choose Destination:
Specify the location where you want to save the new PST file.
Set Options:
Choose the desired options for handling duplicates and subfolders.
Finish the Wizard:
Complete the wizard, and Outlook will create a PST file with the data from the OST file.
Greetings,
Peter