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.

