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Exchange 2010:  How to prepare for divoce?

Posted on 2016-11-12
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Last Modified: 2016-11-13
Hi,

there's an Exchange 2010 running on Server 2008 (R1) that is hosting roughly 300 mailboxes.  This entity is going to be split into two separate installations each requiring their own system.  At the same time it is high time to migrate to 2016.

After this split, the two systems will still be connected, but eventually I would like to split AD in two alltogether.  One will stick with the existing AD, for the other I would love to start with a new domain.

I have never done this.  What is the best way to go about this?  Create a new domain under the same tree?  Can I then install one new VM into the existing domain and one into the new domain under the same tree, install exchange twice, then migrate the mailboxes to their future home?
Is there a way to remove this new domain from this tree later?

Thanks for a rough how-to.

Ralph
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Question by:Ralph Scharping
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Hello,

As far as you want AD independency at the end. You need to create a separate domain/forest for the new environment. This means that you will not configure neither new child domains nor new tree domains, because these options share the same forest, you need to install a new separate domain/forest completely isolated.

In general terms the process is as follow:

1. Create a new separate domain (it will be a new AD forest).
2. Install Exchange server on your new domain.
3. Create trust relationships between your two domains.
4. Migrate both your desired AD users and your Exchange mailboxes. There are many ways to do it, and even different orders. You can search for some options called 'Cross forest migration'. And there are also the tools based on ADMT (Active Directory Migration Tool). Here a few links that can help:

Exchange Cross forest migration
https://blogs.technet.microsoft.com/meamcs/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i/
You can find here some options for executing exchange commands first to move the mailboxes and then execute ADMT to transfer the rest of the AD accounts information, or vice versa.

ADMT (Active Directory Migration Tool Guide)
https://technet.microsoft.com/en-us/library/cc974332(v=ws.10).aspx
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by:Ralph Scharping
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I will give this a shot with a few test accounts.  Thank you.
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