This documentation is archived and is not being maintained.

PidTagUserX509Certificate Canonical Property

This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.

Contains X.509 version 3 security certificates for a messaging user.

Associated properties:




Data type:



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.

Protocol Specifications


Provides references to related Exchange Server protocol specifications.


Specifies the properties and operations for lists of users, contacts, groups, and resources.

Header Files


Provides data type definitions.


Contains definitions of properties listed as alternate names.