If your computer reports that @domain is the old domin than the computer was NOT migrated and the computer is still in the old NT4 domain.
I have eliminated a hundred NT4 domains and you need to force people to use the AD user account. Disable the NT4 user accounts that have been migrated. Remediate and logon problems that crop up.
Then in the AD user's logon script check @domain. Any computer reporting the NT4 domain needs to be moved from the NT4 domain to the AD.
Check into Netdom.exe.
If you follow this process you will successfully complete your migration in short order. I can not speak more strongly on this subject without being rude.
