188.8.131.52.7 PidTagArchivePeriod Property
The PidTagArchivePeriod property ([MS-OXPROPS] section 2.576) specifies the number of days that a Message object can remain unarchived. The PidTagArchivePeriod property can be present on both Message objects and folders and can be set by both client and server.
The presence of the PidTagArchivePeriod property on a Message object indicates that the archive tag on that Message object was explicitly applied by the end user. If the value of PidTagArchivePeriod is 0, the Message object is never archived by the server.
When the PidTagArchivePeriod property is present on a folder, it has no special significance; it simply specifies the archive period that corresponds to the archive tag on that folder.