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To import all existing emails from a PST file, you can use Microsoft Outlook’s built-in Import/Export wizard. Open Outlook, go to File → Open & Export → Import/Export, select Import from another program or file, and choose Outlook Data File (.pst). Browse to your PST file, select the option to handle duplicate items, and choose the mailbox or folder where you want to import the emails. Click Finish to begin the process.
If you need to import multiple PST files or migrate emails without relying on Outlook, you can use the
SysTools PST Converter to export PST mailbox data into supported formats for further migration. Always keep a backup of your original PST file before starting the import process to prevent accidental data loss.