Iamtrying to make the transition from Exchange 2000 to 2007 but I get this error:An error occurred. The error code was 2147947410. The message was The object already exists..I try to execute setup.com /prepareAD and I get the same error.I have 3 servers one is a DC, Other is a Member server with Exchange 2000 that actually have our mailboxes that will be moved to Exchange 20007 and one server with Windows 2003 x64 for Exchange 2007. Tha installation commands was made in this last server.This a part of my exchangeseup.log[2/10/2009 2:11:13 PM] [2] Leaving CAtomOrgCtChildren::ScCreateProxyDLLObjects[2/10/2009 2:11:13 PM] [2] Creating system policies[2/10/2009 2:11:13 PM] [2] Entering CAtomOrgCtChildren::ScCreateSystemPolicies[2/10/2009 2:11:13 PM] [2] Creating System Policies[2/10/2009 2:11:13 PM] [2] Creating System Policies\Mail Enable Recipient[2/10/2009 2:11:13 PM] [2] CAtomOrgCtChildren::ScCreateSystemPolicies (f:\08.01.0240\sources\dev\admin\src\udog\exsetdata\components\server\a_orgctchildren.cxx:604) Error code 0X80071392 (5010): The object already exists.[2/10/2009 2:11:13 PM] [2] Leaving CAtomOrgCtChildren::ScCreateSystemPolicies[2/10/2009 2:11:13 PM] [2] CAtomOrgCtChildren::ScAddDSObjects (f:\08.01.0240\sources\dev\admin\src\udog\exsetdata\components\server\a_orgctchildren.cxx:216) Error code 0X80071392 (5010): The object already exists.[2/10/2009 2:11:13 PM] [2] Leaving CAtomOrgCtChildren::ScAddDSObjects[2/10/2009 2:11:13 PM] [2] CBaseAtom::ScRefreshDSObjects (f:\08.01.0240\sources\dev\admin\src\udog\setupbase\basecomp\baseatom.cxx:1476) Error code 0X80071392 (5010): The object already exists.[2/10/2009 2:11:13 PM] [2] mode = 'Reinstall' (61955) CBaseAtom::ScSetup (f:\08.01.0240\sources\dev\admin\src\udog\setupbase\basecomp\baseatom.cxx:535) Error code 0X80071392 (5010): The object already exists.[2/10/2009 2:11:13 PM] [2] ScSetupAtom (f:\08.01.0240\sources\dev\admin\src\udog\exsetdata\exsetds.cxx:897) Error code 0X80071392 (5010): The object already exists.[2/10/2009 2:11:13 PM] [2] Leaving ScSetupAtom[2/10/2009 2:11:13 PM] [2] [ERROR] An error occurred. The error code was 2147947410. The message was The object already exists..[2/10/2009 2:11:13 PM] [1] The following 1 error(s) occurred during task execution:[2/10/2009 2:11:13 PM] [1] 0. ErrorRecord: An error occurred. The error code was 2147947410. The message was The object already exists..[2/10/2009 2:11:13 PM] [1] 0. ErrorRecord: Microsoft.Exchange.Management.Deployment.ExsetdataException: An error occurred. The error code was 2147947410. The message was The object already exists..[2/10/2009 2:11:13 PM] [1] [ERROR] An error occurred. The error code was 2147947410. The message was The object already exists..[2/10/2009 2:11:13 PM] [1] Setup is halting task execution because of one or more errors in a critical task.[2/10/2009 2:11:13 PM] [1] Finished executing component tasks.[2/10/2009 2:11:13 PM] [1] Ending processing.[2/10/2009 2:11:18 PM] [0] End of Setup[2/10/2009 2:11:18 PM] [0] **********************************************Thank you.Roberto Narvezjrnarvaez

Dear Roberto, Based on your post, I understand that you encounter an error when you try to install Exchange server 2007 in your organization. Based on my research, the root cause may be that Authenticated Users was denied Full Access on System Policies\Mail Enable Recipient Object. You can try to resolve the issue by reset the permission on System Policies\Mail Enable Recipient Object. Please perform the following steps: 1. Assume ownership of System Policies\Mail Enable Recipient Object using DSACLS: DSACLS "dn of active directory object" /G domain name\useraccount:WO Example: DSACLS " CN=Mail Enable Recipient,CN=System Policies,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DC,DC=com" /G domain\administrator:WO 2. Grant Rights to System Policies\Mail Enable Recipient Object using DSACLS: (Note: This will wipe the current DACLS and replace them with what you select) DSACLS "dn of active directory object" /N /G domain name\useraccount:GA Example: DSACLS "CN=Mail Enable Recipient,CN=System Policies,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DC,DC=com" /N /G domain\administrator:GA 3. Set System Policies\Mail Enable Recipient Object permissions back to the Schema Defaults: DSACLS "dn of active directory object" /S Example: DSACLS "CN=Mail Enable Recipient,CN=System Policies,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DC,DC=com" /S Note: Replace the ORG and DC with your exact names. 4. Inherit Permissions: a) Install Windows 2000 or 2003 Support Tools on your domain controller, this tool is located in the Support\Tools folder on the Windows 2000 or 2003 CD-ROM b) Open Adsiedit.msc, 2. Launch adsiedit.msc on your domain controller, find CN=Mail Enable Recipient,CN=System Policies,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DC,DC=com object, c) Right click it and select properties, click security and click advanced buttons, select Allow Inheritable permissions from the parent to propagate to this object and all children objects. Include these with entries explicitly defined there option. d) Click OK. For more information about adsiedit.msc, please refer to the following article: Folder Listing of the Support Tools Included in Windows 2000 http://support.microsoft.com/kb/246926/en-us For more information about how to use Dsacls utility, please refer to the following article: How to Use Dsacls.exe in Windows Server 2003 and Windows 2000 http://support.microsoft.com/kb/281146/en-us If anything is unclear, feel free to let me know. Regards, Rock Wang - MSFT