Enable vCard. Whether or not to enable vCard support for Contacts. vCard is a special file format for electronic business cards. This allows contact information to be sent in a standard way via e-mail. Note that this parameter must be set to "Yes" for the vCard feature to work. If this parameter is "No" and vCard is set to "Show" for a Contact, the vCard link will show but the link will not work correctly. It will only show a blank screen.