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Building out Windows 2008 R2 DC's in our 2003 Forest

We've done all the prep work and have already installed one Windows 2008 R2 DC but its in our Forest root which has only a few user accounts and only a few server accounts. I now need to stand up a Windows 2008 R2 DC in our production Domain where all are Users, Workstations and Servers are. We currently have two Windows 2003 R2 DCs. Here is my concern. I recently stumbled across some default settings in Windows 2008 R2 and I have some concerns about downward compatibility with other servers and clients. Rather than try to explain it, it is clearly outlined in the article:
http://adtroubleshooting.deuby.com/2010/02/w2k8-r2-ad-upgrade-tip-ntlm-changes.html

I don't know if should disable these settings like the article states or just leave the default. Would Microsoft design something that could break existing  infrastructure? Our network is just about all Windows 2003/2008 servers and XP clients but there could be some older clients and servers. Not NT but old. Just wondering if anyone ran into a problem deploying Windows 2008 R2 DC's with these default settings.
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osiexchange
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osiexchange
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Darius GhassemCommented:
There are some clients that could be affected but there are fixes out their to fix these issues. If you are running 98 or NT you might see some of these issues but usually you are good to go. The issues will present themselves when you are running in Windows 2008 functional level.

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/Q_23447631.html
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Mike KlineCommented:
Microsoft can't support the older technology forever; they just don't have the manpower.  Glen also has a list of things to look out for

http://blogs.technet.com/b/glennl/archive/2009/08/21/w2k3-to-w2k8-active-directory-upgrade-considerations.aspx

Like Darius said, if you run really old stuff like NT then you could have issues.

Thanks
Mike
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osiexchangeAuthor Commented:
Thanks. This information is very help. We certainly don't have anything as old as Windows 98 or NT. I think we have maybe a Windows 2000 server here and there but everything else is XP SP3, Vista or Windows 7. On the Server side, Windows 2003 SP2 and R2 and Windows 2008.
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Darius GhassemCommented:
You should be good then there are no issues with Windows 2000
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