Is any deprecation planned for reading PidLidAppointmentSequence and PidLidOwnerCriticalChange via Graph extended properties?

2026-10-06T03:42:20.2533333+00:00

My service reads two Exchange properties from Outlook calendar events through Microsoft Graph singleValueExtendedProperties:

  • PidLidAppointmentSequence: Integer {00062002-0000-0000-C000-000000000046} Id 0x8201
  • PidLidOwnerCriticalChange: SystemTime {6ED8DA90-450B-101B-98DA-00AA003F1305} Id 0x001A

I use them to get the organizer's iCalendar SEQUENCE and DTSTAMP for ordering meeting updates. Has Microsoft announced any deprecation or planned change that would affect reading these properties through Graph extended properties, either in v1.0 or through rich change notifications?


Microsoft Security | Microsoft Graph
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