2.1.3.2.10 Conversation Index

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To generate a Thread-Index header, clients set the value of the PidTagConversationIndex property ([MS-OXOCFG] section 2.2.8.8).

MIME writers copy the value of the PidTagConversationIndex property to the Thread-Index header. The property type is binary; the value is encoded using base64 encoding, as specified in [RFC2045].