2.2.1.2.3 PidTagChangeNumber Property

Data type: PtypInteger64 ([MS-OXCDATA] section 2.11.1)

The PidTagChangeNumber property ([MS-OXPROPS] section 2.632) contains the CN structure, as specified in section 2.2.2.1, that identifies the last change to the message or folder that is currently being synchronized.

For details about the presence of the PidTagChangeNumber property in message change headers, see the SynchronizationExtraFlags field in section 2.2.3.2.1.1.1.