I am trying to install a Windows 2008R2 / Exchange 2010 server into an existing Windows 2003 R2 / Exchange 2003 environment. I have two DCs in two AD sites. One DC holds all the FSMO roles. Last night I upgraded the domain to 2003 Native and forced a replication. There are no replication errors and I checked both DCs, they show the domain being native 2003. I patched both DCs and Exchange to be sure everything was current.No matter what I try, the setup /pl command fails with the following error message.D:\Exchange 2010>setup /pl Welcome to Microsoft Exchange Server 2010 Unattended Setup By continuing the installation process, you agree to the license terms ofMicrosoft Exchange Server 2010. If you don't accept these license terms,please cancel the installation. To review these license terms, please go tohttp://go.microsoft.com/fwlink/?LinkId=150127&clcid=0x409/ Press any key to cancel setup................No key presses were detected. Setup will continue. Preparing Exchange Setup Copying Setup Files ......................... COMPLETED No server roles will be installed Performing Microsoft Exchange Server Prerequisite Check Organization Checks ......................... FAILED The forest functional level of the current Active Directory forest is not Windows Server 2003 native or later. To install Exchange Server 2010, the forestfunctional level must be at least Windows Server 2003 native. The Exchange Server setup operation did not complete. Visit http://support.microsoft.com and enter the Error ID to find more information. Exchange Server setup encountered an error.

Hi,It is the forest that the setup is complaining about. It must also be 2003 nativeLeif

I agree with Leif. To raise your forest functional level; log in to your PDC and go to Active Directory Domains and Trusts. Right click Active Directory Domains and Trust and click on Raise Forest Functional Level. Select windows 2003. For detailed steps on how to install Exch2k10, follow the steps in this article: http://blog.elieb.info/2009/12/01/exchsetup.aspx Elie B. MCITP: EMEA|EA|SA; MCTS: Microsoft Exchange Server 2010: Configuration; Blog: http://blog.elieb.info

Bummer, it already is :-(http://img704.imageshack.us/img704/9522/screenshothj.pngAll my replication looks fine between the DCs. Is there something else I can check to be sure the functionality raise to 2003 actually worked?Additional note: I ran DCDIAG on both DCs and everything came back as "passed"

Image shows Domain functionality. You need to raise forest functionality as well... Raise the forest functional level http://technet.microsoft.com/en-us/library/cc780862(WS.10).aspx Amit Tank MVP: Exchange Server | MCTS: Microsoft Exchange Server 2010, Configuration | MCITP: EMA | MCSA: M Blog: http://ExchangeShare.WordPress.com | User Group: http:/MUC-UG.org.in

I am such an idiot!! I was looking in the right place but the wrong place all at the same time.Thanks for your patience and help!! :-)