Migrating from windows NT 4.0 to Windows 2000

Migrating from windows NT 4.0 to Windows 2000 and the domain name is ABC_123 can you do an inplace upgrade of this?  If not how do you fix it?

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EmmisAsked:
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oBdAConnect With a Mentor Commented:
That is your NetBIOS domain name, and it will stay the same. You will be asked for your FQDN AD domain name during the upgrade, when the dcpromo wizard runs. So this shouldn't be a problem, as NetBIOS names can contain underscores.
The usual way to upgrade without endangering your domain too much:
Install an NT4 BDC on a new machine; make a full replication; promote it to PDC. Take the old PDC (now BDC) offline as a backup. Upgrade the new BDC. If the upgrade fails, you still have the old PDC as a backup solution.
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