I'm trying to set up an Exchange 2010 server in a forest with an existing Exchange 2007 server (one server only). The 2007 server was upgraded from 2003 several years ago and the 2003 server has long since been removed from the domain. I'm failing installation prerequisites for 2010 becuase it is not compatible with Exchange 2003 in the same forest. How do I remove the vestiges of 2003 from my domain so that my upgrade from 2007 to 2010 can proceed?

Hi Exchange server 2003 sp2 is compatible with Exchange Server 2010 on the same organization. please post whole event error or installation error . You can backup AD and remove exchange 2003 through ADSI Manually remove Exchange Server 2003 <script type="text/javascript">// <![CDATA[ loadTOCNode(2, 'summary'); ]]></script> If you cannot remove Exchange Server 2003 by using Add or Remove Programs, you can use Registry Editor to remove the Exchange entries from the registry. Before you edit the registry, you must stop and disable all Exchange 2003 services on the computer. Stop and disable the Exchange Server 2003 services <script type="text/javascript">// <![CDATA[ loadTOCNode(3, 'summary'); ]]></script> The following table lists the core Exchange Server 2003 services. Collapse this tableExpand this table Name Description Distributed Transaction Coordinator Coordinates transactions that are distributed across multiple databases, message queues, and file systems. Internet Information Services (IIS) Admin Service Allows you to administer the Exchange HTTP virtual server in the IIS snap-in. Microsoft Exchange Event Monitors folders and generates events for Exchange Server 5.5 applications. Microsoft Exchange Internet Message Access Protocol (IMAP4) Provides Exchange IMAP4 services. Microsoft Exchange Information Store Manages Exchange information storage. Microsoft Exchange Management Service Hosts Exchange WMI providers Microsoft Exchange Message Transfer Agent (MTA) Stacks Provides Exchange X.400 services. Microsoft Exchange Post Office Protocol version 3 (POP3) Provides Exchange POP3 services. Microsoft Exchange Routing Engine Processes Exchange message routing and link state information. Microsoft Exchange Site Replication Service Replicates Exchange information in the organization. Microsoft Exchange System Attendant Monitors Exchange and provides necessary services. Network News Transfer Protocol (NNTP) Transports newsgroup messages across the network. Simple Mail Transfer Protocol (SMTP) Transports e-mail across the network. World Wide Web Publishing Service Provides HTTP services for Exchange and IIS. To stop and disable the Exchange Server 2003 services, follow these steps: Click Start, point to Programs, point to Administrative Tools, and then click Services. In the Name list, right-click an Exchange service, and then click Stop. After the service stops, right-click the Exchange service again, and then click Properties. In the Startup Type list, click Disabled, and then click OK. Repeat steps 1 through 4 for every Exchange service. Use Registry Editor to remove the Exchange registry keys <script type="text/javascript">// <![CDATA[ loadTOCNode(3, 'summary'); ]]></script> To remove the Exchange registry keys, follow these steps. Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 (http://support.microsoft.com/kb/322756/ ) How to back up and restore the registry in Windows Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange Right-click Exchange, and then click Delete. Click Yes in the Confirm Key Delete dialog box. Repeat steps 2 and 3 for the following registry keys. Collapse this tableExpand this table Registry Key Definition HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DAVEX WebDAV HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EXIFS Microsoft Exchange Installable File System HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ExIPC Epoxy HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EXOLEDB Exchange OLE DB HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IMAP4Svc Microsoft Exchange IMAP4 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeActiveSynchNotify Microsoft Exchange ActiveSynch Notifications HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeADDXA Microsoft Exchange Active Directory Connection Agreements HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeAL Microsoft Exchange Address Lists HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeDSAccess Microsoft Exchange access to Active Directory HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeES Microsoft Exchange Event HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeFBPublish Microsoft Exchange Publish Free/Busy HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS Microsoft Exchange Information Store HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeMGMT Microsoft Exchange Management HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeMTA Microsoft Exchange Message Transfer Agent Stacks HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeMU Microsoft Exchange Directory Service to Metabase HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeOMA Microsoft Exchange Outlook Mobile Access HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeSA Microsoft Exchange System Attendant HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeSRS Microsoft Exchange Site Replication Service HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeTransport Microsoft Exchange Message Routing HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB Microsoft Exchange Outlook Web Access HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\POP3Svc Microsoft Exchange POP3 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RESvc Microsoft Exchange Routing Engine If there is a Notes connector or a GroupWise connector that is installed on the server that is running Exchange Server 2003, do the following: Start Registry Editor. Locate the following subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services Delete any registry entries in this subkey that begin with the following characters: LME- SERVERNAME-LME If Microsoft Office 2003, Microsoft Office XP, or Microsoft Windows SharePoint Service is not installed, do the following: Start Registry Editor. Locate the following subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services Delete any registry entries in this subkey that begin with the following characters: MSSEARCH Additionally, you must rename the <var>Drive</var>:\Program Files\Microsoft Integration\Microsoft Exchange 2003 folder. For example, rename Drive:\Program Files\Microsoft Integration\Microsoft Exchange to <var>Drive</var>:\Program Files\Microsoft Integration\Microsoft Exchange Old. You can read this KB. http://support.microsoft.com/kb/833396Terence Yu TechNet Community Support

I found one small AD error that I could remove with ADSI Edit. Exchange 2010's installer now passes the prerequisite tests. Thank you!