18.104.22.168.4 Inbound vCard Conversion
Incoming vCard attachments SHOULD<191> be converted to a Contact object when received by the messaging server as specified in [MS-OXVCARD]. This section describes additional information about converting an incoming vCardMIME part to its Contact object counterpart.
vCard can appear in any multipart MIME part as well as the root content-type, as specified in [RFC2426]: The vCard format can be sent as the primary body or as the alternative body of a message. In Message object format, however, "vCard/contact" information is only exposed as an attachment.
When the vCard format is encountered within a multipart/alternative MIME part, the MIME reader promotes the vCard content as a contact attachment and disregards it as a message body.