This document explains how to import a previous Outlook .PST file into your current Outlook profile.
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At the top of your Outlook ribbon, select File.
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Select Open & Export > Import/Export. This starts the Import/Export wizard.
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Select Import from another program or file, and then click Next.
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Select Outlook Data File (.pst) and click Next.
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Browse to the .pst file you want to import. Under Options, choose how you want to deal with emails and contacts, then choose Next.
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If a password was assigned to the Outlook Data File (.pst), enter the password, and then click OK.
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If you're importing the contents of your .pst file into your Microsoft 365 mailbox, choose that mailbox here.
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Choose Finish. Outlook starts importing the contents of your .pst file immediately. When the progress box disappears, the import is finished.