Windows 2003 forest merge

Posted on 2006-04-20
Medium Priority
Last Modified: 2010-08-05
Hi, is there any good articles out there or tips and advise on merging two windows 2003 forests together, and then making one company the sub-domain of the other, as an example, companyA.local and companyB.com, after the merge, companyA.CompanyB.local. Our Subsidiary company is taking us over and wants their IT to take control of our domain without trusts being in place.

Many thanks,

- Josh
Question by:joshim_
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LVL 48

Expert Comment

ID: 16503231
Hi joshim_,

with any option that you take regarding the merging, you are going to have to create the child domains manually

i think you would be better to simply scrap the merge and start again - unless we are talking about a massive amount of users, what kind of figures are we looking at


Author Comment

ID: 16505583
Hi, thanks for getting back to me, in total we are looking at about 1000 users across various sites. The company we are merging with would want to keep their structure and domain name as it it, but would like us to be a sub-part of it. Currently there are two external trusts setup so that we can communicate both ways etc, but in the coming months they would like to take control of AD and delegate us permissions, how does the ADMT tool work.

Other than stripping everything apart and starting from scratch, what are the alternatives, or a few pointers would do nicely.

many thanks,

- Josh

LVL 48

Accepted Solution

Jay_Jay70 earned 1500 total points
ID: 16507336
i have a theory which i have never put into place in this scenario but i will lay it out for you

when you demote the last DC in a Domain you remove the domain, however you do not remove all the user data and the AD structure itself, ie, if you were to the run dcpromo again, your structure is still there.....

what i was thinking in your case is that if you simple remove the domain and then promote back up as a child domain, you may retain your structure... this is a maybe though and you should trial it before even thinking about attempting and i am not saying it will work in any way!

You are stuck though as you have two forests and you want a child domain with those users, i would create a child domain with a single DC to start with, then use ADMT to merge all acounts into the child domain, remove the now dead forest and add the additional DC's in


Author Comment

ID: 16507480
Ok, i'll run a few tests to see how it all pans out. Thanks for your help.
LVL 48

Expert Comment

ID: 16507528
no problem mate - if you ever get the chance to test my theory out before i do, can you let me know!!!!

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