Pls Help Migrating 3 domains under one new forest

Hello,

I need some help migrating mutliple domains into one new Forest(Domain).  One of my clients has three different domains (used to be three different company), that used to be in different location.  Now they will all be under one roof. To save power and overall general efficiency I would like to migrate all the domains under one new forest.  I would also like to mention that two of those domains (windows 2003 and 2008 domain contraollers) in the new forest needs to run on same subnet.  The other domain (windows 2003 Domain controller) on the new forest needs to run on a different subnet.  Both of the subnet will be able to communicate with each other.

Thanks
iamaidiotAsked:
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Lionel MMSmall Business IT ConsultantCommented:
On those servers that will no longer be on the same domain or forest and that are also domain controllers you must remove the DC role, reboot, and then remove remaining roles. Once that is done you can then join them to the domain/forest that will remain -- see this link for detail description https://technet.microsoft.com/en-us/library/cc771844%28v=ws.10%29.aspx
iamaidiotAuthor Commented:
Hello,

Thank you for the response.  I meant to say I need to migrate the actual AD.
Lionel MMSmall Business IT ConsultantCommented:
so do you mean you want to merge all the current domains and all their active directories into one?
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iamaidiotAuthor Commented:
Yes.
Lionel MMSmall Business IT ConsultantCommented:
OK that is a lot more complicated. How large are the existing IT resources in those domains/forests you want to merge into a central one? In some instances if they are small enough you may be better served by just manually adding them. However here is a the required link https://technet.microsoft.com/en-us/library/cc974335%28v=ws.10%29.aspx and then one that that gives you added guidance
iamaidiotAuthor Commented:
Resources are small very small. Total of maybe 30 users.  The reason that I didn't want to have entirely new forest is the.users profile. For me I have never been able to properly migrate a profile from one domain to the other
Lionel MMSmall Business IT ConsultantCommented:
OK but we can deal with the profiles (and I assume you mean they all have roaming profiles?) by robocopy(ing) them to the new server(s) where the roaming profiles will be. If you don't use roaming profiles them you can use transfer wizard (Control Panel\All Control Panel Items\Getting Started) to transfer profiles once the users have logged onto the new domain (but this option is time intensive)
iamaidiotAuthor Commented:
Hey Lionelmm,

No its not a roaming profiles but I checked through and the profiles aren't too big so I will just use windows easy transfer to backup the profiles and load them back in when I am done joining the computers back to new domain.  One more question for you. Is there a way I can have GPO or something where I can disjoin the pcs from domain and add it to the new domain?
Lionel MMSmall Business IT ConsultantCommented:
I don't know of anyway to use GPO to remove PCs from a domain; one would think that you could have a GPO to remove a system but I am not aware of one. However since you must be part of a domain there is no way to use GPO to add a system to a domain. Only way I know of is to go to each system and join them to the new domain.

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