Some HSM software products do not support the OFFLINE file
attribute that indicates that a file has been moved to HSM
secondary storage.
In such cases, the Storage Service assumes that a file is
offline when a specific number of days has elapsed since the file
was last modified.
If an item is older than the OfflineDays number of days, the
Storage Service assumes that the file is offline. A value of 0
means that items are assumed to be always online.
If there are more than OfflineDays days between one instance of
a message being archived and the next instance, the Storage Service
archives another copy of the item. Usually all the copies of a
shared item are archived at the same time so only one copy is
archived.
If items stay online for longer than seven days, you may want to
change the default offline setting.
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