188.8.131.52.2 Type: KEY
RFC reference: [RFC2425] section 3.7.2.
vCard data format: KEY;ENCODING=b:[data]
Brief description: A public key or authentication certificate that is associated with the object that the vCard represents.
Importing to and Exporting from Contact Objects
If the KEY type represents an X.509 certificate, the KEY type is imported to and exported from the PidTagUserX509Certificate property ([MS-OXOABK] section 184.108.40.206). Other certificate types are not imported.