Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)

We have an exchange2003 running without problem.
We installed and uninstalled exchange2010.
We are trying to install a new exchange server but still have this error:
 Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)
rmaillouxSystem AdministratorAsked:
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rmaillouxConnect With a Mentor System AdministratorAuthor Commented:
I recreated it after unmount all the stores
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Shahnawaz AhmedTechnical Services SpecialistCommented:
Hello Dear,

Have run all these commands before starting installation?

Setup.com /ps

Setup.com /preparedomain

Setup.com /preparead

I would suggest to run all the above commands and start the installation or you can run Setup.com /preparead and continue installation

Cheers,
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Shahnawaz AhmedTechnical Services SpecialistCommented:
One of the EE Answer authenticate the above commands.


Please go through this
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_26296094.html
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rmaillouxSystem AdministratorAuthor Commented:
Hi,  Yes i did them:

Setup.com /ps

Setup.com /preparedomain

Setup.com /preparead

I would suggest to run all the above commands and start the installation or you can run Setup.com /preparead and continue installation

before but still same answer...
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Shahnawaz AhmedTechnical Services SpecialistCommented:
Is it new Exchange 2010 installation or Are you trying to upgrade from any older version i.e 2003 or 2007?
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rmaillouxSystem AdministratorAuthor Commented:
A new installation of exchange 2010. but the old exchange2003 still running
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Simon Butler (Sembee)ConsultantCommented:
Was Exchange 2010 Uninstalled correctly? It sounds like someone has deleted the admin group that is created by the installation but there is still some trace there.

Have you tried creating a new Admin group with that name? It has to be 100% exact as the error.

Simon.
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rmaillouxSystem AdministratorAuthor Commented:
Yes i recreated it with a copy-paste and created Routing group container and the system strategy container too but the installation cant see....
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Simon Butler (Sembee)ConsultantCommented:
Check in the registry for any keys called Watermark under each role in this location.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v14.0\

there could be three - MailboxRole, ClientAccessRole and HubTransportRole.

If there is, delete them then run the prep commands again.

Simon.
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rmaillouxSystem AdministratorAuthor Commented:
I did erease them many times last week without nothing better...
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Simon Butler (Sembee)ConsultantCommented:
I don't know what else to suggest.
When Exchange 2010 was removed you obviously did some extra steps to remove it, perhaps outside of the official Microsoft documentation, but didn't complete them correctly.

You are probably looking at one of two options.

1. A call to Microsoft support, as they will be able to look at the server.
2. A new forest and doing a cross forest migration.

Simon.
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rmaillouxSystem AdministratorAuthor Commented:
I found the solution myself
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