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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