Problem Problems installing Exchange 2010 RC1 with Exchange 2003 SP2 already exisiting

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Hi All,

Wondering if anyone else is experiencing this problem: Problems installing Exchange 2010 RC1 with Exchange 2003 SP2 already exisiting

I'm running Exchange 2003 with SP2 install (we've got a front-end & back-end setup) on Windows Server 2003 R2, both have had all the latest updates applied. The server that I'm trying to install Exchange 2010 RC1 on is Windows 2008 R2. Our domain/forest level is Windows 2008 R2.

I have done the following steps to prepare the domain/forest:

1. I've made sure that the following are already installed:
a. Install Microsoft .NET Framework 3.5.
b. Install Windows Remote Management ( WinRM ) 2.0 Community Technology Preview 3 (CTP3)
c. Install Windows PowerShell V2 CTP3.

2. Run the following PS commands:
a. ServerManagerCmd -i RSAT-ADDS
b. ServerManagerCmd -i Web-Server
c. ServerManagerCmd -i Web-ISAPI-Ext
d. ServerManagerCmd -i Web-Metabase
e. ServerManagerCmd -i Web-Lgcy-Mgmt-Console
f. ServerManagerCmd -i Web-Basic-Auth
g. ServerManagerCmd -i Web-Digest-Auth
h. ServerManagerCmd -i Web-Windows-Auth
i. ServerManagerCmd -i Web-Dyn-Compression
j. ServerManagerCmd -i NET-HTTP-Activation
k. ServerManagerCmd -I RPC-over-HTTP-proxy

3. I have run the following commands:
a. Setup /PrepareLegacyExchangePermissions
b. setup /PrepareSchema
c. setup /PrepareAD [/OrganizationName: <organization name> ]
d. setup /PrepareAllDomains or setup /PrepareDomain (I went for all domains)

According to MS, we should be able to have 2010 & 2003 coexist together now. However we get error messages saying:

However I have made sure that I've downloaded the RC1 version and not the beta, so the error message doesn't apply.

Does anyone have any idea's please? Or if you're in the same situation I'd like to hear about your experiences.

Thanks

-ken