<div>
You can technically start within any domain but I prefer to start in the root domain then work my way down to the child domains. You need to run adprep32 or adprep to prep your domain and forest for a Windows 2008 Server R2 to be added as we DC.<br />
<br />
<a href="https://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/A_3644-Windows-2008-Server-R2-adprep-adprep32.html" rel="ugc">https://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/A_3644-Windows-2008-Server-R2-adprep-adprep32.html</a>
</div>


You can technically start within any domain but I prefer to start in the root domain then work my way down to the child domains. You need to run adprep32 or adprep to prep your domain and forest for a Windows 2008 Server R2 to be added as we DC.

https://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/A_3644-Windows-2008-Server-R2-adprep-adprep32.html [https://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/A_3644-Windows-2008-Server-R2-adprep-adprep32.html]

<div>
There is a root domain and two sub domains. I'll carefully read the documents you posted and try in an experimental environment first. Thanks for your suggestions.
</div>


There is a root domain and two sub domains. I'll carefully read the documents you posted and try in an experimental environment first. Thanks for your suggestions.

<div>
<div class="content wysiwyg-content">
In an 2003 active directory environment where there are multiple domains<br />
(two sub domains), how to realize the upgrade proccess to windows 2008 r2 active directory? Where to start from? Thanks.
</div>
</div>


In an 2003 active directory environment where there are multiple domains
(two sub domains), how to realize the upgrade proccess to windows 2008 r2 active directory? Where to start from? Thanks.

Windows Server 2003 Active Directory Upgrade to 2008 R2 with multidomain structure

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.