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Both are GCs<br />
Only DC! is running DNS<br />
The clients are using only DC1 for DNS
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Both are GCs
Only DC! is running DNS
The clients are using only DC1 for DNS

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Correction, DC2 does have DNS running, but DHCP is pointing to DC1 for all IP info. 
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Correction, DC2 does have DNS running, but DHCP is pointing to DC1 for all IP info.

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It didn't really provide the answer.
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<div class="content wysiwyg-content">
I have three brand new servers. <br />
Mail &nbsp;(Exchage 2010) (Server 2008 R2)<br />
DC1 &nbsp;(Server 2008 R2)<br />
DC2 &nbsp;(Server 2008 R2)<br />
<br />
I set up DC1 and the Mail server first. &nbsp;Got my certificate, set up the autodiscover, OWA, Outlook Anywhere, etc. I set up three users initially. Tested and no errors, no problems. &nbsp;I installed the 2nd DC. &nbsp;This DC will be in a different location for users to authenticate locally and then access email over a MPLS circuit. Currently these servers are on the same network and they seem to be communicating.<br />
<br />
I installed the other DC, set up additional users, and all is fine. &nbsp;However, once I take the DC2 ofline to get it ready to ship, the new users cannot login and the offline address book updates and has only the first three users in it. &nbsp;What am I missing? <br />

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I have three brand new servers. 
Mail  (Exchage 2010) (Server 2008 R2)
DC1  (Server 2008 R2)
DC2  (Server 2008 R2)

I set up DC1 and the Mail server first.  Got my certificate, set up the autodiscover, OWA, Outlook Anywhere, etc. I set up three users initially. Tested and no errors, no problems.  I installed the 2nd DC.  This DC will be in a different location for users to authenticate locally and then access email over a MPLS circuit. Currently these servers are on the same network and they seem to be communicating.

I installed the other DC, set up additional users, and all is fine.  However, once I take the DC2 ofline to get it ready to ship, the new users cannot login and the offline address book updates and has only the first three users in it.  What am I missing? 


Microsoft Exchange 2010 and Windows 2008 AD

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.