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joining a 2008 server to act as backup DC on a 2003 domain

Posted on 2014-07-21
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Last Modified: 2014-07-26
Hello,

I have a 2003 DC moving to a new location and in the meantime I'd like to join a 2008 server to that domain to act as temporary DC during move.  Is that possible?  I'm thinking yes, but everything I'm finding online goes through upgrading a 2003 server to 2008.  

Thank you!
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Question by:emjay180
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by:Seth Simmons
Seth Simmons earned 250 total points
ID: 40210680
yes
build your server, run adprep on the 2003 server, then dcpromo on 2008; also make the 2008 a global catalog

Running Adprep.exe
http://technet.microsoft.com/en-us/library/dd464018(v=ws.10).aspx

if the 2003 server will be offline for a short time, suggest transferring the fsmo roles to the 2008 server

Using Ntdsutil.exe to transfer or seize FSMO roles to a domain controller
http://support.microsoft.com/kb/255504

you should change any static addresses and DHCP scope(s) to use the 2008 server for DNS
once you verify the 2008 server is replicating ok from the 2003 server, you can take the 2003 server offline
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by:Lee W, MVP
Lee W, MVP earned 250 total points
ID: 40210694
You don't have to upgrade the server, but you DO have to upgrade the domain.  The new features in 2008 require "extensions" to the 2003 domain.  The 2003 domain controller will still work fine PROVIDED you DON'T raise the domain or forest functional levels (they DO NOT need to be!)

If this is a small domain there is no reason to transfer the FSMO roles - they can be down for small domains for weeks and no one will likely notice (you shouldn't keep the server offline that long anyway, but it's really not an issue for small domains)
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emjay180 earned 0 total points
ID: 40210826
Thank you.  The more I do VMware and Citrix the less I remember about Windows Server.  They're 20 users, if everything hits the fan, I could rebuild their domain and call it a day.  I'll do it your way and that is what I gathered from my own research.  Wanted to make sure from all my new expert exchange friends.  That's why I have it.  Thanks again.
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by:emjay180
ID: 40215997
Quick follow-up.  I'm running the adprep with the required switches on the 2003 using a 2008 OS install disk?
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by:Seth Simmons
ID: 40216167
yes; needs to be executed on the server with specific roles
if all are on that one server then it all gets done there

http://technet.microsoft.com/en-us/library/dd464018(v=ws.10).aspx#BKMK_RunAdprep
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by:emjay180
ID: 40221174
Both had valid answers.
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