Decommissioning old Win2k3 DC impact on Exchange Server mail flow and client Outlook connection ?

People,
I'm going to decommission one of the three AD Domain Controllers / Global Catalog during the business hours that is used by the Exchange Server 2010 SP3 due to it is still running Win2k3 (Exchange Management Console > Server Configuration >
Client Access | System Settings tab, I can see the three DC/GC as follows DC01-VM, DC02-VM, DC03-VM).
So if one of the DC above in the tab is decommissioned during the business hours, is there any impact or steps that I need to take to avoid any email outage or problem ?
Let me know what is the correct steps if possible.
Thanks,
/* Server Support Specialist */

You may wish to remove the DC that is going to be decommissioned from the GCs available for use by Exchange.
In any event that that is the GC that is being used by Exchange during the course of decommission, you will encounter issues.
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Hi Vincez,
How do I do that on Exchange Server 2010 SP3 ?
My understanding is that the DC/GC is detected and used by Exchange when it is on the same AD Site.
/* Server Support Specialist */

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