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You can't demote a SBS DC to a member server.<br />
As suggested above, either use transition pack or maually redo your account etc on a new domain with Wi2k3 server, as trust between domain also not supported by &nbsp;SBS DC.<br />
Here's a good link regarding the transition:<br />
<a href="http://support.microsoft.com/kb/555073" rel="ugc nofollow">http://support.microsoft.com/kb/555073</a>
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You can't demote a SBS DC to a member server.
As suggested above, either use transition pack or maually redo your account etc on a new domain with Wi2k3 server, as trust between domain also not supported by  SBS DC.
Here's a good link regarding the transition:
http://support.microsoft.com/kb/555073 [http://support.microsoft.com/kb/555073]

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Yesterday I attempted to replace our only server (domain controller, GC, DNS, etc) with a new server we purchased. The old server is running Small Business Edition 2003 and the new server is Standard Edition 2003. <br />
<br />
After making new server a domain controller, Installing DNS, assigning it global catalog and transferring FSMO roles successfully. I noticed on reboot, it took very long at preparing network connections and when finally logged in, I noticed Error in event log saying <br />
<br />
&quot;Active Directory could not resolve the following DNS host name of the source domain controller to an IP Address, this prevents additions, deletions, and changes in AD........&quot; <br />
<br />
When I try and demote old server from being a DC, it says it can't find any other DC's on domain and cannot continue.<br />
<br />
PLEASE HELP, VERY URGENT
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Yesterday I attempted to replace our only server (domain controller, GC, DNS, etc) with a new server we purchased. The old server is running Small Business Edition 2003 and the new server is Standard Edition 2003. 

After making new server a domain controller, Installing DNS, assigning it global catalog and transferring FSMO roles successfully. I noticed on reboot, it took very long at preparing network connections and when finally logged in, I noticed Error in event log saying 

"Active Directory could not resolve the following DNS host name of the source domain controller to an IP Address, this prevents additions, deletions, and changes in AD........" 

When I try and demote old server from being a DC, it says it can't find any other DC's on domain and cannot continue.

PLEASE HELP, VERY URGENT

Issue replacing windows 2003 SBS with Windows 2003 sever

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.