22.214.171.124.5 MetaTagIdsetUnread Meta-Property
Property ID: 0x402E
Data type: PtypBinary, 0x0102 ([MS-OXCDATA] section 2.11.1)
The MetaTagIdsetUnread property contains a serialization of REPLID-based IDSET structures. The IDSETs contain IDs of messages that were marked as unread (as specified by the PidTagMessageFlags property in [MS-OXCMSG] section 126.96.36.199) since the last synchronization, as identified by the initial ICS state. For more details about how an IDSET is serialized, see section 188.8.131.52.