Exchange 2007 Installation

KCTechNet
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I'm preparing to install Exchange 2007 for the second time on my Windows 2003 environment.  A while back I had configured Exchange 2003 but ended up removing this server from my environment without uninstalling Exchange 2003 or removing the server from AD.  In order to start fresh, I want to delete any instances of Exchange 2003 and Exchange 2007 from my environment.  I noticed when using the ADSI Edit utility, I see many entries with
CN=ms-Exch under the Schema Tab.  I have already delete Exchange instances from the Domain Tab.  Can I delete all of the entries that have CN=ms-Exch next to them?  Are they all part of either an old installation of Exchange 2003 or Exchange 2007?  Please advise.  Thank you.    
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Satya PathakLead Technical Consultant

Commented:
Solution :1
Warning Before you remove a Microsoft Exchange Server 2003 server from a production environment that has multiple servers in the site, make sure that you know all the roles that are held by the server. Take steps to move those roles to another server before you follow the steps in this article to remove the Exchange Server. For example, the server may hold special roles such as site folder server or routing group master, or the server could be listed as a bridgehead server on a connector such as an SMTP connector or a routing group connector.

http://support.microsoft.com/kb/833396
Solution: 2
How to completely remove Exchange 2000 or Exchange 2003 from Active Directory.
You may have to completely remove all instances of Microsoft Exchange 2000 Server and Microsoft Exchange Server 2003 from the Active Directory directory service. This article describes how to do so.

http://support.microsoft.com/kb/273478
Solutions Architect, Project Lead
Top Expert 2013
Commented:
Never touch the Schema Partition :( :(

If you want to remove the server object from your environment do this
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_24833787.html

Also if there is some info about a Old DC not removed properly get a Metadata cleanup
http://support.microsoft.com/kb/216498

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