If you have your Outlook data exported to a file, you can import it to your outlook account with the steps below:
Step 1: Click "File" from the Ribbon;
Step 2: Click "Open&Export" from the left;
Step 3: In the "Import and Export Wizard" window, select "Import from another program or file" from the list and click "Next";
Step 4: Select "Outlook Data File (.pst)" in the "Export to a File" window and click "Next";
Step 5: Click "Browse" to the location where the exported file is saved, and select one of the 3 options in the new window and click "Finish" to import.
– Replace duplicates with items exported;
– Allow duplicate items to be created;
– Do not export duplicate items.