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Install Microsoft Outlook. Show hidden files and folders. Go to Outlook data folder. Close Microsoft Outlook. Copy and paste PST files.
If you haven’t installed Microsoft Outlook on your new computer yet, do it now. On the new computer, you need to put your Outlook data files inside the default Outlook directory for your user files. Same as from the old computer, this directory is hidden.  You need to show these hidden folders first before you put anything in them. From any open folder on your desktop, go to Folder Options. Under the Folder Options, select the View tab. Under the hidden files and folders in the Advanced settings section, tick “Show hidden files, folders, and drives”. Same as from the old computer, the data files used by Outlook is stored under your user’s documents. The directory where the Outlook data files are located is under “Users\%USERNAME%\AppData\Local\Microsoft\Outlook” or something with a similar structure. Open this folder. You can also put your Outlook .pst files in another folder, just make sure you remember where it is and configure Outlook to look for it later on. Before you copy anything, you have to close Microsoft Outlook first.  This will ensure the data you’re putting in won’t conflict with an active and open one. If Outlook is open when you do your copy, you may face some errors. Insert the external storage device where you put your .pst files from the old computer. Copy the .pst files and paste it on the Outlook directory you’ve set in Step 3. Your .pst files are now on your new computer.