Step. I. Login to the webmail interface, At the top of the page, click on 'Address book' icon.
Step. II. Address book page appears with a list of address and other management features.
Step. I. Scroll down to 'Address book export' form. Choose field delimiter (1) or provide a custom field delimiter (2). Select a Text delimiter (3) or enter a Custom delimiter(4).Finally click on 'Export CSV File' button.