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Know more:- Import a PST file into Outlook 2010
In Outlook 2010:
Select the File tab.
In the Info category, select the Account Settings button and then select Account Settings.
In the Account Settings window, select the Data Files tab.
Select Add, select Outlook data file (. pst), and then select OK.
Type a unique name for the new . pst file.
Close Outlook.
Regards,
Willjoe