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Have you tried this route to uninstall Exchange 2K3? 
<a href="http://www.msexchange.org/tutorials/Remove-Exchange-server-entire-Exchange-organization.html" rel="ugc">http://www.msexchange.org/tutorials/Remove-Exchange-server-entire-Exchange-organization.html</a>
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That was the path that was taken initially, &nbsp;I however think I may have figured it out, looking further into adsiedit on the DC I found the exchange references, &nbsp;I thought they were installed by exchange 07 when I first looked at them but they were referencing the old organization, &nbsp;I renamed all the OU's and reran the 07 setup and it has gotten past the part where it was bombing, &nbsp;hopefuly that solved it, I will post results forthcoming.
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Well, so much for thinking it was going to work, &nbsp;The install completed without errors, so I figure everything in cool, I create a mailbox for my user account, go back to my machine and outlook 2007 picks up the information as I am setting up the exchange account, &nbsp;it then gets an error saying that I need to connect to the mailbox first and outlook cannot open. &nbsp;So I tried to login to owa and it seems to give me more error infomation listed below. &nbsp;It appears that I can not connect to the infomation store now. &nbsp;Grrrr frustrating. &nbsp;I tried rebooting the server to no avail. 
 
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Request 
Url: <a href="https://thor.appweb.local:443/owa/default.aspx" rel="ugc">https://thor.appweb.local:443/owa/default.aspx</a> 
User host address: 10.10.10.219 
 
Exception 
Exception type: Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException 
Exception message: Cannot open mailbox /o=Appointlink/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=jasons. 
 
Call stack 
 
Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) 
Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) 
Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString) 
Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(LogonType logonType, ExchangePrincipal owner, ADOrgPerson delegateUser, Object identity, OpenMailboxSessionFlags flags) 
Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType logonType, ExchangePrincipal owner, ADOrgPerson delegateUser, Object identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String clientInfoString) 
Microsoft.Exchange.Data.Storage.MailboxSession.Open(ExchangePrincipal mailboxOwner, WindowsPrincipal authenticatedUser, CultureInfo cultureInfo, String clientInfoString) 
Microsoft.Exchange.Clients.Owa.Core.OwaWindowsIdentity.CreateMailboxSession(ExchangePrincipal exchangePrincipal, CultureInfo cultureInfo) 
Microsoft.Exchange.Clients.Owa.Core.UserContext.Load(OwaContext owaContext) 
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.CreateUserContext(OwaContext owaContext, UserContextKey userContextKey, UserContext&amp; userContext) 
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.PrepareRequestWithoutSession(OwaContext owaContext, UserContextCookie userContextCookie) 
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.InternalDispatchRequest(OwaContext owaContext) 
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchRequest(OwaContext owaContext) 
System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) 
 
Inner Exception 
Exception type: Microsoft.Mapi.MapiExceptionLogonFailed 
Exception message: MapiExceptionLogonFailed: Unable to open message store. (hr=0x80040111, ec=-2147221231) Diagnostic context: Lid: 18969 EcDoRpcExt2 called [length=797] Lid: 27161 EcDoRpcExt2 returned [ec=0x0][length=108][latency=0] Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropLogon [254] Lid: 17082 ROP Error: 0x80040111 Lid: 26937 Lid: 21921 StoreEc: 0x80040111 Lid: 27962 ROP: ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- Lid: 26426 ROP: ropLogon [254] Lid: 22970 Lid: 8620 StoreEc: 0x80040111 Lid: 10786 dwParam: 0x0 Msg: THOR Lid: 1750 ---- Remote Context End ---- Lid: 26849 Lid: 21817 ROP Failure: 0x80040111 Lid: 26297 Lid: 16585 StoreEc: 0x80040111 Lid: 32441 Lid: 1706 StoreEc: 0x80040111 Lid: 24761 Lid: 20665 StoreEc: 0x80040111 Lid: 25785 Lid: 29881 StoreEc: 0x80040111 
 
Call stack 
 
Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, Int32 ec, DiagnosticContext diagCtx) 
Microsoft.Mapi.ExRpcConnection.OpenMsgStore(OpenStoreFlag storeFlags, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, MapiStore msgStorePrivate, String&amp; correctServerDn, ClientIdentityInfo clientIdentityAs, String userDnAs, String applicationId, CultureInfo cultureInfo) 
Microsoft.Mapi.ConnectionCache.OpenMapiStore(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, ClientIdentityInfo clientIdentity, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) 
Microsoft.Mapi.ConnectionCache.OpenMailbox(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, WindowsIdentity windowsIdentityAs, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) 
Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry)
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Hello, 
I am attempting to install exchange server 2007 into an organization that previously had Exchange server 2003 installed. &nbsp;The server that had Exchange 03 was having replication issues so Exchange was removed from it and it was forcibly demoted to a member server. &nbsp;The old 03 server has since been retired and is no longer available on the network. &nbsp;I went to install a fresh install of exchange 2007 and the install stops at the mail flow settings part to connect to an existing exchange 2000 or 2003 organization. &nbsp;If I click the browse button it sees the server that previously had exchange 03 on it. &nbsp;I leave the box blank on the mail flow settings part and continue with the installation. &nbsp;The install gets to the hub transport role section and it bombs out saying &nbsp;&quot;Error: &nbsp;Could not find the default Administrative Group &quot;Exchange Administrative Group&quot; (GYDIBOHF23SPDLT)&quot; &nbsp;After looking up this error initially I found a microsoft article that talks about going in and removing the watermark key from the registry and reruning setup. &nbsp;I did that and it still fails. &nbsp;I also used adsiedit to look for anything that is showing a trace of the old exchange server, but I could not find anything. &nbsp;Basically what I need to do is simply get a fresh copy of exchange installed, &nbsp;the mailboxes that were on the old server do not matter to me (good thing cause that server is gone) &nbsp;I just need to get the users on this domain setup to a new instance of exchange &nbsp;Thanks
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Hello,
I am attempting to install exchange server 2007 into an organization that previously had Exchange server 2003 installed.  The server that had Exchange 03 was having replication issues so Exchange was removed from it and it was forcibly demoted to a member server.  The old 03 server has since been retired and is no longer available on the network.  I went to install a fresh install of exchange 2007 and the install stops at the mail flow settings part to connect to an existing exchange 2000 or 2003 organization.  If I click the browse button it sees the server that previously had exchange 03 on it.  I leave the box blank on the mail flow settings part and continue with the installation.  The install gets to the hub transport role section and it bombs out saying  "Error:  Could not find the default Administrative Group "Exchange Administrative Group" (GYDIBOHF23SPDLT)"  After looking up this error initially I found a microsoft article that talks about going in and removing the watermark key from the registry and reruning setup.  I did that and it still fails.  I also used adsiedit to look for anything that is showing a trace of the old exchange server, but I could not find anything.  Basically what I need to do is simply get a fresh copy of exchange installed,  the mailboxes that were on the old server do not matter to me (good thing cause that server is gone)  I just need to get the users on this domain setup to a new instance of exchange  Thanks

Fresh install of Exchange Server 2007 still sees remnents of old exchange server 2003

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.

Operating Systems

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.