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Replacing old windows 2003 server with Windows 2008 domain controller

Posted on 2013-11-19
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Last Modified: 2013-12-08
I have an old Windows 2003 domain controller running on a VMware virtual machine on Windows 2008 server. There is a second domain controller on the network that I want to remove from the network.

I'm getting a brand new server running Windows 2008 R2 that I want to use as the new domain controller.  

By the way, I already have a new Windows 2008 R2 running Exchange 2010 standard and Exchange has been working great for over one year now.  I don't want to mess this up, especially if Exchange is in the picture.

Here is what I'm thinking about doing.

1. Remove the second domain controller from the network  - demote it to just a windows server.  It's currently being used as a file sharing server right now, which will be replaced also with a  new windows 2008 r2 server.

2. Migrate 2003 to 2008 R2 as domain controller.

3. Remove 2003 from the network.

At the end I should have only one domain controller running on Windows 2008 R2 (new server), Exchange working without any problems (existing server), and a new file server (this server replaces the current second domain controller on the network as file sharing only).

What is the easiest and fastest way of doing this without any potential down time?
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Question by:Anthony H.
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Sandeshdubey earned 250 total points
ID: 39661519
The plan of action looks good however I will recommend to promote new Server in domain point the dns setting of client,exchange and member server to new DC then shutdown the old server during business hours and check the impact if no issue reported you can demote the server as per requirement.

However I will recommend to have atleast two DC in the network for redundancy with single DC you will be at risk.You also need to move the FSMO role to new DC and dont forget to configure authorative time server role on DC.http://support.microsoft.com/kb/816042

See this will be helpful to promote the DC:http://msmvps.com/blogs/mweber/archive/2012/07/30/upgrading-an-active-directory-domain-from-windows-server-2003-or-windows-server-2003-r2-to-windows-server-2012.aspx

If you are planning to remove Win2003 DC below links will be helpful.
http://technet.microsoft.com/en-us/library/cc740017(WS.10).aspx (how to demote a DC)
http://technet.microsoft.com/en-us/library/cc755937(WS.10).aspx (how to decommisioning a DC)
http://technet.microsoft.com/en-us/library/cc771844(WS.10).aspx (how to removing a DC from a Domain)

Hope this helps
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by:SagiEDoc
SagiEDoc earned 250 total points
ID: 39661588
You plan is spot on, Sandeshdubey is also right. The only thing you need to add is enabling the global catalog on the new 2008 domain controller and making sure it is in the correct site if you have more than two. Also it is important as Sandeshdubey said to have at least two DC's. When I did our domain migration from 2003 to 2008 I set up all the new 2008 DC's, gave them plenty time to replicate and settle and then one by one removed the 2003 DC's. I did the removal after hours because I wanted the IP addresses moved from the old DC's to the new DC's as I had a lot of clients and devices configured with static DNS addresses.
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by:Anthony H.
ID: 39664859
I'm not following or understanding what you mean to setup my 2008 first.

Could you please elaborate more and point more specifics?

would this encompass everything that I need to do? > http://www.youtube.com/watch?v=LatpzBtkJUI
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by:SagiEDoc
ID: 39665513
What we mean is that you must setup a new server loaded with Server 2008 R2 and then add the DC roll to this server. Once this new server is up and running as a DC you can demote the 2003 DC and decommission it.
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by:Anthony H.
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I have to transfer all the fsmo roles to the 2008 r2 before "demoting" 2003 right?
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by:SagiEDoc
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That would be correct.
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by:Sandeshdubey
ID: 39680116
Yes,you need to transfer fsmo role before you demote DC and also configure authorative time server role as suggested.

I will recommend to shutdown the old dc and check the impact during business hours and if no issue reported by users then proceed with demotion.
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