Step 1: Open your outlook. Step 2: Go to File and select Open and click Import option. Step 3: Select Import from another program or file in the list that is in the small window, the click Next option. Step 4: Click "Outlook Datafile (.pst) " , then click "NEXT". Step 5: Click the Browse and browse to folder where the .pst file is. Step 6: Select the file and click Next option. Step 7: Finally, click Finish option.