Where should the first 2016 DC be introduced the Forest domain or the child domain?

I am preparing for an AD upgrade from 2008 R2 to 2016.  I have an "empty" Forest root domain with only 2 DCs and nothing else.  The child Domain has 10 DCs.
Where should the first 2016 DC be introduced the Forest domain or the child domain?  Or, does it not matter.
Thanks.
Jose ThorneAsked:
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Todd NelsonSystems EngineerCommented:
Where should the first 2016 DC be introduced the Forest domain or the child domain?  Or, does it not matter.

You shouldn't if you happen to have Exchange 2010 or older in your forest.  If you don't have Exchange, disregard.
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MAS (MVE)EE Solution GuideCommented:
It is always recommended to have it installed in your ADSite where you FSMO holder is existing.
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MaheshArchitectCommented:
You can add additional DC to either child domain or root domain itself, that's not make any difference

Your forest root domain is empty root domain, so better add new 2016 DC's in child domain 1st and later on you can add them to parent domain later point of time
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Jose ThorneAuthor Commented:
Todd,
We do have Exchange 2010, but have moved on to gmail, so no one is using Exchange.  We plan to have it decommissioned before the AD upgrade starts.   But that brings up a new question - What does happen to Exchange 2010 if you upgrade to AD 2016? Does it simply break Exchange (like no one can login to mailboxes, etc), or does it have other more serious consequences.  
In other words, in my case, since no one is using Exchange, (but we still have it up because management is scared to turn it off) will it effect the upgrade to 2016?
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MAS (MVE)EE Solution GuideCommented:
Agree with Todd, There is no 2016 DC support for Exchange 2010.Please check this for more details.
https://technet.microsoft.com/en-us/library/ff728623%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396


@Todd,
Thanks for pointing the missed point.
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MaheshArchitectCommented:
According to exchange supportability matrix, 2016 dc servers are supported with exchange 2010 sp3 ru5 and above
https://technet.microsoft.com/library/ff728623(v=exchg.150).aspx
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Todd NelsonSystems EngineerCommented:
What does happen to Exchange 2010 if you upgrade to AD 2016?

You would not be able to uninstall Exchange 2010 in the normal way.  The uninstall will fail because of the presence of a Windows 2016 DC.  If you introduce a Windows 2016 DC prior to removing Exchange 2010 and plan to remove it through the uninstall process, you would need to demote all Windows 2016 DCs before proceeding.

I strongly encourage you to remove Exchange 2010 prior to promoting that first Windows 2016 server to a DC or install an Exchange 2016 server and decom 2010.
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Todd NelsonSystems EngineerCommented:
According to exchange supportability matrix, 2016 dc servers are supported with exchange 2010 sp3 ru5 and above
https://technet.microsoft.com/library/ff728623(v=exchg.150).aspx

Mahesh, that is incorrect.

Supported-AD.png
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MAS (MVE)EE Solution GuideCommented:
As commented by Todd it is not supported. Either uninstall Exchange 2010 or upgrade Exchange2010 to Exchange2013SP1 or Exchange2016 before promoting 2016 server to a DC. Here is a similar thread.
https://social.technet.microsoft.com/Forums/en-US/c6b79674-d319-468e-9f5a-ede4c733633a/compatiblity-with-server-2016-dcs-ad?forum=exchange2010
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MaheshArchitectCommented:
You are right,
I over looked article
Its my bad
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Jose ThorneAuthor Commented:
Ok thanks for all the Exchange 2010 comments.  We will surely uninstall Exchange 2010 before proceeding with the AD 2016 upgrade.
Thanks again.
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MAS (MVE)EE Solution GuideCommented:
Glad to know our comments helped.
Wish you good luck. :))

MAS
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Todd NelsonSystems EngineerCommented:
Sufficient guidance provided for solution.
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