We are getting ready to add 2008 server to our domain. I just wanted to see if anyone ran into any problems. Below is the info on our domain. I am getting ready to run adprep /forstprep and I just want to check one last time before I run it.Domain function level: 2003Forest level: 2000Exchange 2003 SP2

Note You only have to run adprep when you want the Windows Server 2008 servers to become Active Directory Domain Controllers. Note There is a very good Microsoft Knowledge Base article on Common Mistakes When Upgrading a Windows 2000 Domain To a Windows 2003 Domain, written by community experts. I suggest you read it. (twice) Most of the contents also apply to transitioning from Windows Server 2003 (R2) to Windows Server 2008 Note Make backups of all your Domain Controllers and verify you can restore these backups when needed. Note To fully prepare your Active Directory for Windows Server 2008 be sure to run all the necessary adprep.exe commands. You need to run the following commands on the following servers in your Active Directory environment: Command Domain Controller adprep.exe /forestprep Schema Master adprep.exe /domainprep Infrastructure Master adprep.exe /domainprep /gpprep Infrastructure Master adprep.exe /rodcprep * Domain Naming Master * Optional when you want to deploy Read Only Domain Controllers. After preparing your Active Directory for Windows Server 2008 be sure to check the process. Breadcrumbs to failures may be found in the event viewer, but real men will check the adprep.log files.

Hello, Many thanks to Sander for sharing these information. For some details about this, please also refer to the "Install a new Windows Server 2008 domain controller in an existing Windows 2000 Server or Windows Server 2003 domain" section of the following article: Scenarios for Installing AD DS: http://technet2.microsoft.com/windowsserver2008/en/library/708da9f7-aaad-4fa1-bccb-76ea8569da501033.mspx?mfr=true Besides, there should be no problem when you add an additional Windows Server 2008 as a DC into your existing domain with an Exchange 2003 server in it, and you don't need to take any additional actions for that. Hope it helps and have a nice day! Best regards, Chang Yin

Dear Berkouwer,i have some problem to install additinal domain controller 2008 in 2003 existing domain.what steps i am doing please check listed below.1. installed windows server 2008 on a new hp machine.2. provided the dns addrss of 2003 doman controller in network connection and manaul ip address.3.went to manage server 2008 and install domain services.4.run dcpromo and select additional domain controller it ask abt domain name and in a moment give message that run first adprep /forestprep .when i tried to do it from source/adprep ,got a error message that active directory must be installed.5.i treid to run adprep.exe from domain controller 2003 but i found msg that "Forest-wide information already updatedstatus/Consequencesadprep did not try to rerun.because i am new in 2008 so i am stuck plz help me