DAV property names: urn:schemas:calendar:dtstamp, http://schemas.microsoft.com/mapi/owner_critical_change

Data type: PtypTime ([MS-OXCDATA] section

The PidLidOwnerCriticalChange property ([MS-OXOCAL] section gets or sets the date and time at which a Meeting Request object was sent by the organizer. The value is specified in Coordinated Universal Time (UTC).

This property corresponds to the DTSTAMP property, as specified in [MS-OXCICAL] section

For more details about the PidLidOwnerCriticalChange property, see [MS-OXPROPS] section 2.199.