Updated: March 28, 2003
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
Trust relationships between Windows NT 4.0 domains use NetBIOS domain names. During the in-place upgrade of your Windows NT 4.0 environment, if some of your Windows NT 4.0 domains have trust relationships with other Windows NT 4.0 domains that are then upgraded into separate forests, those trust relationships between the domains in different forests remain, but continue to use the NetBIOS domain name. It is recommended that trust relationships between domains in different forests use the DNS name for the domain in order to gain better functionality in a Windows Server 2003 environment. To rename the trust relationship by using the DNS name for the domain, delete and recreate external trust relationships that exist between Windows NT 4.0 domains and Active Directory domains in different forests. Trusts that use NetBIOS names and exist between Windows NT 4.0 domains can be left in place.