Use SecureCopy !
SecureCopy migrates your data and Accounts to ActiveDirectory fast and Reliable, even Servers with Trusts...
How: When a trust exists between the domains, you can migrate the accounts with SecureCopy. However, if the trust is ended once the migration is completed, the migrated accounts will resolve not to names, but to security identifiers (SIDs) and "account unknown" entries will be seen in the access control lists (ACLs).
To resolve this situation use SecurityExplorer to clone the permissions on Users and Groups on the Source Domain have to the data, to users and Groups on your Target Domain.
Once the cloning operation is complete you can dissolve the thrust and be migrated, fast and in total security, with total control...
Who says Migration from NT Trusts to Windows Server 2003 has top be a difficult task that only expensive consultants can handle ?