Step 1: Open your outlook. Step 2: Go to File and select Open and click Import option. Step 3: Select Export to a file and then click Next. Step 4: Select outlook Datafile(.pst) and then click on Next. Step 5: Select the email account name that you wish to take a .pst file. Step 6: Click Browse button and decide where you will export .pst file and then click OK. Step 7: Click Finish. Step 8: A password box will pop-up. Now you can set a password for .pst file.