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There are several reasons why archiving fails completely for some Microsoft Exchange Server mailboxes but still works for others, or why not all the items that you expect to be archived are archived.
If Enterprise Vault fails to archive anything from some Microsoft Exchange Server mailboxes then the following may apply:
The most likely cause is that those mailboxes have not been enabled for archiving.
It is possible that the clock on the computer that is running the Exchange Mailbox task is wrong by a large amount, such as weeks or days. The Exchange Mailbox task uses the local clock to determine the date and time. If this clock has a very different time from that on the Microsoft Exchange Server computer, archiving is affected. On a test system you might be more aware of this problem and so notice it even if the clocks are only a few minutes different.
If Enterprise Vault is archiving some items from a mailbox and is missing others, the problem could be any of the following:
The user has overridden the archiving settings so that the items are never going to be archived, or are not yet ready to be archived.
You have a new Enterprise Vault installation and the system has not yet reached its normal state. It may take several runs of the Exchange Mailbox Task before all items that are ready to be archived are actually processed.
The user has no access to the archive. Check through the Application Event Log to find out if there are any messages that help with solving the problem.
The user has changed the amount of time before an item is ready for archiving, and items are consequently not yet eligible for archiving.
The item's message class has not been added to the list of those that Enterprise Vault archives. To add more messages classes, use the Directory Properties: Advanced property page.
The Vault Service Account permissions on the Exchange tree are incorrect.
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