Export all the data in your address books into a data file. It even recognizes fields with self-defined labels. You can choose between various export formats, like Excel Workbook, XML with optional XSLT processing, TSV, CSV, HTML table and customizable vCard (in Contacts, you cannot specify which fields to export when you create a vCard - in Exporter for Contacts, you can).
You are able to select which contacts to export, which fields from those contacts and how to order them. For later reuse, you can save all of that as a template.
In Contacts, you can assign self-defined labels to various fields. Exporter for Contacts can recognize and export fields with self-defined labels.