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Exchange 2010 Dependant on Old DC

I have Exchange 2010 installed on its own DC, which is the FSMO role holder.  Its 2008 R2 server.
I also have an old DC running 2003.  Every time it gums up and I need to reboot it, Exchange on the new server dumps and wont start.  How can I rehome Exchange to the new 2008R2 server and make it so that even if the old one dies, there are no dependencies on the old box?
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Sr. Systems Administrator
you would use
Set-ADServerSettings -PreferredServer <server name>

How to Use a Specific Domain Controller in Exchange 2010 Management Shell

also, exchange is not recommended to be installed on a domain controller

Installing Exchange on a domain controller is not recommended
Will SzymkowskiSenior Solution Architect
Most Valuable Expert 2015
Top Expert 2015

I have Exchange 2010 installed on its own DC,
This not a recommended scenario. When Exchange is installed on a DC it only references this one. Also do not demote the DC where Exchange is installed on because that will break Exchange.

You will need to do the following steps
- bring up a new server 2008R2
- install Exchange (all roles)
- configure URL's / receive connectors/send connection
- move mailboxes to the new Exchange server
- point your new CAS role to the outside for 25/443 (NAT)

The decommission the old Exchange server.

AmitIT Architect
Distinguished Expert 2017

Normally, I create different AD site dedicated to Exchange only. In your case, I might open MS case and ask them what I can do currently to overcome this situation and then plan for major change as Will said above.