Step 1.Open your Microsoft Outlook and the click on File option from left side of menu bar.
Step 2.Then click on Open & Export option.
Step 3.Now click on Import/Export option.
Step 4.Select option Export to a file.
Step 5.Make sure to select Outlook data file (.pst)
Step 6.Select all folders including Sub-folders.
Step 7.Now select folder in your local system or some other place to export it then click on next.