How do I retire old domains and integrate with existing domain?

Hello,

In an enterprise environment, I've been asked to consolidate and retire existing domains.

For Ex. the following domains exist:

abc.com - existing domain - parent
xyz.com - separate domain, numerous computers, groups, accounts out there
lmn.com - completely separate domain and forest

Where do I start and what is the process before I do anything?

abc.com basically bought xyz.com and lmn.com - after many years, abc.com decides to consolidate and fully bring them over and integrate into abc.com

From my understanding - this would include migrating users, groups, SIDS and what not. I'd like to have a better understanding of the high level and move forward to more precise steps. I have several months to work on this so am prepping for more info. Thanks in advance.
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Raymond PengSystems EngineerAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
When you are doing any sort of consolidation with Active Directory (moving objects between domains or forests) you have to use the Active Directory Migration Tool (ADMT). Using this you will be able to successfully move AD specific objects to another domain.

ADMT Guide
https://technet.microsoft.com/en-us/library/cc974332(v=ws.10).aspx

You also need to take into consideration regarding Exchange. Using the ADMT will not move Exchange specific Objects, i.e. mailboxes, etc. Depending on the version of Exchange you are running, you will need to use additional scripts PrepareMoveRequest.ps1 or exporting mailboxes and then importing them into the domain where you are performing your consolidation.

Once you have completed the migration you can collaps the domain and remove the domain controllers. Make sure that you are 100% sure before you do this final change.

Will.
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Raymond PengSystems EngineerAuthor Commented:
Management has scrapped this for now but this has led me to the right path. I will post additional questions in the future. Thank!
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