How to safely change the domain controllers that Exchange use from Out-Of-Site into the In-Site ?

Hi Folks,
I'd like to know what's the best way to edit the Exchange Server 2007 entry
In-Site entries and removing the entries from Out-Of-Site safely without causing any downtime or problem with the workstations ?
From the MSExchange ADAccess Event ID 2080, I can see that the Domain Controllers that is currently used by Exchange Servers is all on the
In-Site lists which I need to decommission due to office building migration and downsizing, the workstations remain in the same building only the servers must go.
Current configuration:
Exchange Servers AD Site: HQ1 (for all roles)
Workstations AD Site: HQ1
Proposed configuration:
Exchange Servers AD Site: Prod-DC1 (for all roles)
Workstations AD Site: HQ1
Thanks.
/* Server Support Specialist */

Hi,
Steve's clarification is right.
From your description, you want to change the DC used by Exchange server. If I have misunderstood your concern, please let me know.
Please make sure the following things before setting the DC for Exchange:
1. New DC has its own IP in its TCP/IP as primary DNS server.
2. New DC is global catalog.
3. New DC has correct DNS settings in the MSDC folder.
4. Restart the Exchange active directory topology discovery service and watch the event viewer, there should be an event that discover both domain controllers. If this happens, then turn off the old DC.
Besides, topology information will remain in the system attendant service for 15 min, so the time to switch to the new one is about 15 minutes.
Hope my clarification is helpful.
Best regards,
If you have feedback for TechNet Subscriber Support, contact
[email protected]
Amy Wang
TechNet Community Support
Amy,
The Exchange Server has been rebooted couple of times but yes, all of the In-Site AD servers are still on not rebooted yet.
So in this case do you suggest me to demote the oldDC and turn off all of the In-Site DC/GC first and then reboot Exchange Server after wards one by one ?
/* Server Support Specialist */

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