Regardless, if you're trying to use Outlook as an archive, then you can control the AutoArchive settings centrally using Group Policy if you install an ADM template from the Office Resource Kit. This is described in the Microsoft Office Online document entitled Setting Up Retention Settings in Outlook 2003.
Depending on your requirements, you may want to look at a proper archival solution from a third-party vendor -- Outlook's AutoArchive was never intended to provide an enterprise-class archival solution, and PSTs have many limitations.
Hope that helps!
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