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Design - Upgrade an existing 2k3 Active Directory domain to 2k8 and must change DNS name

I currently have DC's with active directory 2k3 domain named abc.company.com  The end result required is all Users/Groups account migration to new Server hardware with 2k8 domain named company.com  Any help with a plan as how to migrate and how to deal with moving individual user profiles with the least administrative effort (as MS often says) would be helpful.

I am struggling with how to setup and migrate as the current parent domain becomes the child domain during the migration.
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Mike KlineCommented:
In your current setup is abc.company.com a child domain of company.com?
peter235Author Commented:
company.com is the actual company domain name based on a Unix / Linux infrastructure. Windows are taking over! providing dns and other major services. Currently the abc. is in fact w2k. to identify hardware and is a child dns zone to company.com.
peter235Author Commented:
This has died on the vine. I actually created a new trusted Forest and will migrate all across gradually, at least AD is clean
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