Module for Importing and exporting Vcards
You can check the vCard module. It can be useful for you.

Here is a quote about it (from the module's project page):


  ... adds a vCard download link to every users profile. This link makes it easy to add users on your Drupal site to your local address book. Since we love microformats, there is also a theme function (theme_vcard) for displaying user data in the hCard format.