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Exchange 2010 and AD Issue

Scenario

DC1 - Exchange 2010 /DNS/GC
DC2 - DNS/GC - PDC
DC3 - DNS/GC

I am currently working on demoting DC1 as a domain controller and leaving just for Exchange server.  As a first test I have stopped the ADDS service on DC1 and hoping the exchange to work using the other DCs.

Webmail worked fine but outlook got disconnected and kept on asking for credential. Also active sync stopped working on the mobile devices.

So far Exchange is not pointing to DC1.

Am I missing something here or need to look for more things before I do another test.
What are the other things I should consider.
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itcaptain
Asked:
itcaptain
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2 Solutions
 
smithandandersenCommented:
I would imagine all your FSMO roles are on 1st DC
Move to another DC then test
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itcaptainAuthor Commented:
No FSMO roles are on DC2 and DC3
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Cliff GaliherCommented:
You absolutely cannot promote or demote a domain controller after exchange has been installed. It does break and there is no way to restore the functionality.
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itcaptainAuthor Commented:
cgaliher,  

Is the reason that I cannot demote/promote a domain controller due to the fact that AD and Exchange were installed on the same machine?

I have seen tutorials floating around where is was done when the AD and Exchange were on seperate machines.

Thanks
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Cliff GaliherCommented:
Yes, sorry if that was unclear. Demoting a DC that has exchange on it breaks exchange. But so does PROMOTING a machine to a DC if it has exchange. That is a per-machine limitation, not a per-network or per-organization.
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smithandandersenCommented:
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