2.2.3.7 PidTagExpiryTime Property
Type: PtypTime ([MS-OXCDATA] section 2.11.1)
The PidTagExpiryTime property ([MS-OXPROPS] section 2.690) can be present when a client requests to receive an expiry event if the message arrives late.
If the PidTagExpiryNumber property (section 2.2.3.5) and the PidTagExpiryUnits property (section 2.2.3.6) are both present, the value of this property is recomputed by the following formula; the original value is ignored.
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PidTagExpiryTime = PidTagClientSubmitTime + PidTagExpiryNumber * TimeOf(PidTagExpiryUnits)