Export or backup email, contacts, and calendar to an ...
https://support.microsoft.com/en-us/office/export-or-backup-email-contacts-and-calendar-to-an-outlook-pst-file-14252b52-3075-4e9b-be4e-ff9ef1068f91
The export begins immediately unless a new Outlook Data File (.pst) is created, or if the export is to an existing file that is password protected. If you are creating a new Outlook Data File (.pst), an optional password can help protect the file.
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