1. Open the Export Address Books form via one of the following ways.
The first way
Click 
in the Toolbar.
The second way
Click 
in the Address Books pane, and select Export from the drop-down menu.
The Export Address Books form will appear with a list of all existing address books.
2. Tick checkboxes corresponding to address books that you want to export. If you want to select all the address books, tick the checkbox next to Name.
3. Enter the file name in the Name field, and select the export format from the Export Format form. At present, only x-vcard is supported.
4. Click Export All to start exporting all the address books or click Export Selected Only to export your selected ones only.