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PidTagUserX509Certificate Canonical Property
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Contains X.509 version 3 security certificates for a messaging user.
MAPI mail user
This property is used by applications that utilize public-key security. It holds a binary representation of one or more X.509 version 3 security certificates.
Various applications and clients can use this property for their own security certificates. The binary format of the X.509 data can vary among vendors.