2.2.3.4.4.1 Content-Type

The vCard MIME part is characterized by a Content-Type of "text/directory" with a profile of "vCard" for vCard format Version 3.0, as specified in [MS-OXVCARD]. If the Content-Type is "text/x-vCard", then the vCard MIME part uses vCard format Version 2.1, as specified in [RFC2426]. <192>