Best solution for bringing together 3 domain controllers?

Hi there experts,
we have a client that f, has a three separate dc across their business. The servers are in locations near to eachother. All server 2012.
 This was originally setup for security I am told but the problem is the departments cannot access eachothers data..
The problem is that ideally there should be one main domain controller. Someone has mentioned site and services as a solution?
They use Office 365 , so down the line may consider single sign on server.
For one of the domains they use azure active directory, for another domain controller thy have on premise active directory.
 Essentially we want to get them onto one domain, and enable remote access between all the users.
What do you recommend?
LVL 1
unrealone1Asked:
Who is Participating?
 
Adam BrownConnect With a Mentor Sr Solutions ArchitectCommented:
You would want to pick a single domain to move the others into, then use Active Directory Migration Tool (ADMT) to migrate the user objects over with SID history.

That said, if there is a network connection between the environments, it would likely be beneficial to set up active directory trust relationships between the domains. That would allow you to grant permissions for resources in each of the other domains. That's probably the solution that would require the least amount of time, planning, and effort, since migrating domains into another domain is a pretty major undertaking (Specifically, the most difficult part of AD migration is getting computers and servers moved to the new domain, and if Exchange or other AD integrated apps are in the mix, that makes it much more difficult).
1
 
unrealone1Author Commented:
Thank you for the insight
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.