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The manual method is not straightforward; it is a two-step process.
New Outlook PST file is now created.
In this step, the data from existing PST data files will be transferred to the new file created in Step 1.
Importing from old Outlook PST data file is successful, but Step 2 has to be repeated to complete the migration from multiple PST data files. Above, the data is imported from a single file only, though the iterative count of Step 2 would depend on the number of PST data files you have from which you wish to import data into a single Outlook PST file.