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Open Outlook and go to File > Open & Export > Import/Export
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Select Import from Another Program or File.
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Go to Next, select Outlook Data File (.PST) and go to Next.
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Select Browse and navigate to the location of the existing PST.
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Go to Next and then go to Browse and select the location of the PST you would like to import.
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Go to Next where you will be able to select which parts of the PST you wish to import and where you would like to import the files to.
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Go to Finish.