188.8.131.52 PidTagOrdinalMost Property
Type: PtypInteger32 ([MS-OXCDATA] section 2.11.1)
The PidTagOrdinalMost property ([MS-OXPROPS] section 2.810) contains a positive number whose negative is less than or equal to the value of the PidLidTaskOrdinal property (section 184.108.40.206.26) of all Task objects in the folder. This property MUST be updated to maintain this condition whenever the PidLidTaskOrdinal property of any Task object in the folder changes in a way that would violate the condition.
This property provides an efficient way to identify Task objects as being in the same folder.