At the top of your Outlook ribbon, choose the File tab.
Choose Open > Import.
In the Import and Export Wizard, click Import from another program or file, and the click Next.
Select Outlook Data File (.pst), and then click Next.
Choose Browse, then choose the .pst file you want to import, and choose Next.
NOTES: Under Options, if you want the imported information to replace duplicate items already in Outlook, choose that. Otherwise, choose Do not import duplicates.
If a password was assigned to the Outlook Data File (.pst), you are prompted to enter the password, and then click OK.
Set the options for importing items. Choose Filter if you want to only import certain emails. Choose theMore Choices tab if you want to only import emails that are read or unread.The default settings usually don’t need to be changed. The top folder — usually Personal Folders, Outlook Data File, or your email address — is selected automatically.
Include subfolders is selected by default. All folders under the folder selected will be imported.
Select one of the destination options:
Import items into the current folder – this imports the data into the folder currently selected.
Import items into the same folder in – this imports the data into the destination folder of the same name as the source folder, e.g., from Inbox to Inbox. If a folder doesn’t exist in Outlook, it will be created.
Choose Finish. Outlook starts importing your data immediately. You’ll know it’s finished when the progress box closes.