2.2.3.4.4 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 vCard MIME 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 at the root level of a MIME message, the MIME reader promotes the vCard as a contact attachment to a Message object with no body.
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.