The Outlook Add-In copies items from the user's Outlook
.OST file to the Vault Cache before
the items are due to be archived. The process is known as
preemptive caching. Preemptive caching takes place on the user's
computer. It reduces the number of items that need to be downloaded
from the mailbox archive to the Vault Cache when the two are
synchronized.
Preemptive caching obeys the settings in the Exchange mailbox
policy's archiving rules.
The Outlook Add-In uses the value when it determines the age of
items on which to perform preemptive caching. To determine the age,
it deducts the value from the value in the Exchange mailbox
policy's archiving rules.
For example, you do not change from its
default value. You set the mailbox policy setting to six
weeks. The Outlook Add-In deducts the default value
of seven days from six weeks, and preemptively caches the items
that are five weeks old or older.
Note that if you use an archiving strategy that includes quotas,
it is difficult to predict the age at which items are archived. It
is then usually advantageous to preemptively cache items as soon as
possible. Enterprise Vault therefore uses 0 days as the age at
which to perform preemptive caching if both of the following are
true:
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