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While there is an in-place upgrade for NT 4.0 to Windows 2003, it is
usually not recommended unless you are very small. Exchange, however, does
not support an in-place upgrade from 5.5 to 2003. It is also likely that
you are running on old hardware and this presents an opportunity to
acquire new equipment that will last three or more years. With this
available, you can migrate your user accounts with ADMT (Active
Directory Migration Tool), synchronize the directories with ADC (Active
Directory Connector) and then migrate the mailboxes and public folders
with other tools provided. Exchange 2003 includes the Exchange
Deployment Tool (ExDeploy), which will walk you through the steps.
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