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Advice on Migrating from Windows 2003 to Window 2008 Domain

We have an 2003 Active Directory Forest with a
Parent Domain called USA.com
Child Domain NY.USA.com

We want to create a new 2008 Domain but change the Domain name to
Parent Domain USA.corp
Child Domain NY.USA.corp

We then want to migrate the user/computer accounts via ADMT.
That's the plan.

I get the feelign when I setup a trust between the 2 domains I will have an issue with NETBIOS.

Parent Netbios for both domains will be USA
Child Netbios for both domain with be NY

1) So Will i have any issues with the NetBios?
2) Is it easier to migrate to 2008 (inplace) then rename the domain later?  (we have Exchange 2003 sp2)


Windows Server 2008Active DirectoryWindows Server 2003

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Krzysztof Pytko

8/22/2022 - Mon
Krzysztof Pytko

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What i didn't want to rename.

Will I have an issue with NETBIOS?
Krzysztof Pytko

OK, then you will face an issue because of NetBIOS name conflict and you won't be able to create forest trust between these 2 forests :/

However, there is a way to do that :) You need to create 2 additional forests. 1  temporary and one target. Temporary let's say: tempdom.local with NetBIOS TEMP and migrate everything from the old one to the temp. Remove forest trust between old and temp, shut down DCs for the old forest. Then establish forest trust between temp and taget and migrate everything to the final state. After all clean TEMP by decommissioning it and removing trust.

That's all in short if you don't want to rename it :)


Ok what if I wanted to Create a clean 2008 Domain.  Can i migrate users from the 2003 to 2008?  Do you know of a Step by Step?

Also what is better?  2008 or 2008R2
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck

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Krzysztof Pytko

Hi, I'm sorry for delayed answer, I was on vacations :)

Yes, this is really good idea to set up completely new forest and migrate objects from the old one. For that I would suggest using Windows Server 2008R2 as it has much more features and it is really good (remember that R2 is only 64 bit architecture OS! and your hardware must be capable of supporting it)

I have no complete solution for that, however I would try to describe it step-by-step with appropriate articles:

1) Configure new forest root domain to be ready for objects migration.

2) When you have new forest structure then you can start migrating objects from the old domain to the new one. For that you can use free ADMT v3.1 from Microsoft or paid solution from Quest (it also migrates Exchange mailboxes!)

ADMT 3.1 can be downloaded from

and document describing whole migration process. Read it first, before you will start migration

3) Configure routing between these 2 locations to be able that you can ping all Domain Controllers using their IP addresses

4) Open necessary ports on router/firewall to allow forest trust setup

5) Configure DNS Conditional forwarders for these 2 domains to be able to create forest trust
for 2003 DCs: http://support.microsoft.com/kb/304491
for 2008 DC: http://technet.microsoft.com/pl-pl/library/cc794735%28v=ws.10%29

6) Configure two way transitive trust between the old and new forests

7) Install ADMT agents within both forests and follow Microsoft ADMT guide

8) At the end, promote additional DC for new domain for redundancy

everything should be fine