2003 to 2012 AD Upgrade

Quick question about 2003 to 2012 AD Upgrade. I've figured out the basic steps to upgrade the AD functional level.   Found several good docs such as http://community.spiceworks.com/how_to/57636-migrate-active-directory-from-server-2003-to-server-201...

A quick background of the environment.Client has one dc currently on 2003 server. There are several other 2008 member servers. We are adding a 2012 server that will become the new DC. We'll add a second 2012 DC in the next few weeks.

I have a question about the old 2003 DC. Once I demote it from being a DC will it still function normally concerning things like radius, dns, dhcp? Also does upgrading the Domain affect any other services such as Exchange 2010 (it's on a separate 2008 member server), terminal services again on an totally separate 2008 member server.

Obviously we will eventually move all of the services off of the 2003 server to the new 2012 DC server but I want to make sure they'll continue to run until we have time to redesign the new DHCP, radius etc on the 2012 server. Maybe a week or two at the most. If we need to do it all at once we'll have to move the project out a week.  

Thanks
bevegeAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
Once I demote it from being a DC will it still function normally concerning things like radius, dns, dhcp?

dns is integrated with AD so you won't have that; need to point static clients (and update dhcp scope(s)) to the new server first; it otherwise should run fine

Also does upgrading the Domain affect any other services such as Exchange 2010

exchange 2010 (SP3 with RU5 or later) supports 2012 domain controllers; terminal services should be fine

Exchange Server Supportability Matrix
https://technet.microsoft.com/en-us/library/ff728623%28v=exchg.150%29.aspx
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Luis MouraCommented:
You can install the DNS role on 2012, and work with the 2 severs online.

When you demote the 2003 point to dns on 2012.

DHCP you can migrate if you want.
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Windows Server 2003

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