Hi, I'm trying to install Exchange 2007 on a child domain. I've run PrepAD and Schema on the root domain. The following errors were encountered when I tried to install the 1st Exchange server Exchange Setup logs [12/2/2008 2:12:33 PM] [2] [ERROR] Unexpected Error [12/2/2008 2:12:33 PM] [2] [ERROR] Multiple objects of type 'Microsoft.Exchange.Data.Directory.SystemConfiguration.ContentFilterConfig' having the same identity have been found. This indicates a data store corruption. [12/2/2008 2:12:33 PM] [2] Ending processing. [12/2/2008 2:12:33 PM] [1] The following 1 error(s) occurred during task execution: [12/2/2008 2:12:33 PM] [1] 0. ErrorRecord: Multiple objects of type 'Microsoft.Exchange.Data.Directory.SystemConfiguration.ContentFilterConfig' having the same identity have been found. This indicates a data store corruption. [12/2/2008 2:12:33 PM] [1] 0. ErrorRecord: Microsoft.Exchange.Configuration.Tasks.ManagementObjectAmbiguousException: Multiple objects of type 'Microsoft.Exchange.Data.Directory.SystemConfiguration.ContentFilterConfig' having the same identity have been found. This indicates a data store corruption. [12/2/2008 2:12:33 PM] [1] [ERROR] Multiple objects of type 'Microsoft.Exchange.Data.Directory.SystemConfiguration.ContentFilterConfig' having the same identity have been found. This indicates a data store corruption. [12/2/2008 2:12:33 PM] [1] Setup is halting task execution because of one or more errors in a critical task. [12/2/2008 2:12:33 PM] [1] Finished executing component tasks. [12/2/2008 2:12:33 PM] [1] Ending processing. Event logs Event Type: Error Event Source: MSExchangeSetup Event Category: Microsoft Exchange Setup Event ID: 1002 Date: 12/2/2008 Time: 3:26:05 PM User: N/A Computer: ORANGEXCT0201 Description: Exchange Server component Hub Transport Role failed. Error: Error: Multiple objects of type 'Microsoft.Exchange.Data.Directory.SystemConfiguration.ContentFilterConfig' having the same identity have been found. This indicates a data store corruption. Event Type: Error Event Source: MSExchange ADAccess Event Category: General Event ID: 2152 Date: 12/2/2008 Time: 3:25:34 PM User: N/A Computer: ORANGEXCT0201 Description: Process ExSetupUI.exe (PID=2196). An remote procedure call (RPC) request to the Microsoft Exchange Active Directory Topology service failed with error 1753 (Error 6d9 from HrGetServersForRole). Make sure that the Remote Procedure Call (RPC) service is running. In addition, make sure that the network ports that are used by RPC are not blocked by a firewall. Event Type: Error Event Source: Userenv Event Category: None Event ID: 1030 Date: 12/2/2008 Time: 2:53:44 PM User: NT AUTHORITY\SYSTEM Computer: ORANGEXCT0201 Description: Windows cannot query for the list of Group Policy objects. Check the event log for possible messages previously logged by the policy engine that describes the reason for this. Event Type: Error Event Source: Userenv Event Category: None Event ID: 1058 Date: 12/2/2008 Time: 2:53:44 PM User: NT AUTHORITY\SYSTEM Computer: ORANGEXCT0201 Description: Windows cannot access the file gpt.ini for GPO CN={31B2F340-016D-11D2-945F-00C04FB984F9},CN=Policies,CN=System,DC=OM,DC=APPLE,DC=ORANGE. The file must be present at the location <\\OM.APPLE.ORANGE\sysvol\OM.APPLE.ORANGE\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\gpt.ini>. (The system cannot find the file specified. ). Group Policy processing aborted. any idea what could have gone wrong, and what can i do? thanks

Looks like you fixed this issue right? http://forums.msexchange.org/m_1800494656/mpage_1/key_/tm.htm#1800494656