2.2.2.1 CN Structure
A CN structure contains a change number that identifies a version of a messaging object. CNs are identical in format to Folder ID structures ([MS-OXCDATA] section 2.2.1.1) and Message ID structures ([MS-OXCDATA] section 2.2.1.2), except the GlobalCounter field represents a change to a messaging object rather than a messaging object itself.
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ReplicaId |
GlobalCounter |
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ReplicaId (2 bytes): A 16-bit unsigned integer identifying the server replica in which the messaging object was last changed.
GlobalCounter (6 bytes): An unsigned 48-bit integer identifying the change to the messaging object.