2.2.1.13 PidTagInReplyToId Property

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Type: PtypString ([MS-OXCDATA] section 2.11.1)

The PidTagInReplyToId property ([MS-OXPROPS] section 2.743) corresponds to the in-reply-to field, as specified in [RFC2822], and contains the value of the original message's PidTagInternetMessageId property (section 2.2.1.12). This property is set on all message replies.