Hi All, Currently, I have two Domain controllers and there are installed in two Windows 2003 servers. I am planning to upgrade the Comain controllers to Windows 2008 servers. Can anybody give me a guide which has steps or a link which guid administrator to upgrade it? Thanks in advance. --qq

Hello, this is the guide you are searching for: http://technet.microsoft.com/en-us/library/cc731188(WS.10).aspx Note that you can not upgrade from 32 bit to 64 bit. So, if you have a 32bit DCs and you want to upgrade one of them to 2008 64 bit, you have to demote the DC (transfer FSMO roles that it is holding to another DC if it is holding some FSMO roles) and then perform a clean install of the new server and promote it again. If you are using 2008 32 bit, you can perform an in-place upgrade. Perform backups before proceeding. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration

Before you can introduce the first 2008 DC, you'll need to prepare the schema. Preparing your Active Directory Infrastructure for 2008 http://www.anitkb.com/2010/03/preparing-your-active-directory.htmlVisit: anITKB.com, an IT Knowledge Base.

Hi all, thank you so much for your help.