2.2.8.1 PidLidConversationActionLastAppliedTime Property
Type: PtypTime ([MS-OXCDATA] section 2.11.1)
The PidLidConversationActionLastAppliedTime property ([MS-OXPROPS] section 2.82) SHOULD<22> be the time (in UTC) that an E-mail object was last received in the conversation or the last time that the user modified the conversation action, whichever occurs later.