There are many third-party vendors that produce NT to Active Directory migration tools, including the company I...
work for. You should do an exhaustive evaluation based on the criteria important to your purchasing decisions, should you go down the third-party route.
On the Exchange migration, again you will need either ExMerge from Microsoft (free), or Intra-Org, which uses the Active Directory Connector (ADC) and places the Exchange 2003 server in the Exchange 5.5 site. Or, you can do an Inter-Org migration, which is definitely best done with some third-party tools.
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Dig Deeper on Microsoft Exchange Server 2003
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