How to upgrade AD from W2K3 R2 to W2K8 R2?

This is using a single DC with W2K3 AD. My management is planning to buy a new server, and ask to me to deploy a W2K8 R2 DC on it. Ultimately, we already want to migrate the AD into W2K8 environment. That means at the end of the project, we have this new server as W2K8 R2 DC, the existing server still a W2K3 secondary DC. Shall I setup this server with w2k8 r2 and then promote it as DC? any forest/domain prepare should I perform?

thanks in advance!
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David Paris VicenteSystems and Comunications  Administrator Commented:
Here goes a step by step from: Upgrade

hope this could help you.
Seth SimmonsSr. Systems AdministratorCommented:
here is a good guide

the links above refer to 2008, not R2 which has slight differences or describe an in-place upgrade which is not what you are looking for
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Mohammed TahirMicrosoft Exchange and O365 AdministratorCommented:
Yes you have to run adprep /forestprep to update the schema version before adding Windows 2008 R2 as Domain controller.

1- Forest schema version 47: Windows Server 2008 R2 Adprep /forestprep.

2- How to migrate Windows 2003 Active Directory to Windows 2008 Active Directory

Oops ! Sorry  I forgot to add link in my comment

See the assisted and accepted solution here

Try those troubleshooting steps

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MezzutOzilAuthor Commented:
After reviewing the docs, all are very good. The upgrading  activity is proposed on October, and I am confident to get it done.
Hi Which solution in this article made your day ,can you please clarify was it a firewall issue or some other. ? We need to know what was exactly happened and how you tackled the issue
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Windows Server 2008

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