Exchange Server 2010 - Setup /PrepareSchema Fails

jm00rman
jm00rman used Ask the Experts™
on
I am installing an exchange server 2010 on Windows server 2008 R2. When attempting to run setup /PrepareSchema, the following error occurs:

No key presses were detected.  Setup will continue.
Preparing Exchange Setup

    Copying Setup Files                           COMPLETED

No server roles will be installed

Performing Microsoft Exchange Server Prerequisite Check

    Organization Checks                                       COMPLETED

Configuring Microsoft Exchange Server

    Extending Active Directory schema                         FAILED
     The following error was generated when "$error.Clear();
          if ($RoleDomain -ne $null)
          {
          initialize-ExchangeLegacyPermissions -Domain $RoleDomain -DomainContro
ller $RoleDomainController;
          }
          else
          {
          initialize-ExchangeLegacyPermissions -AllDomains:$true -DomainControll
er $RoleDomainController;
          }
        " was run: "Object reference not set to an instance of an object.".


The Exchange Server setup operation didn't complete. More details can be found
in ExchangeSetup.log located in the <SystemDrive>:\ExchangeSetupLogs folder.

Exchange Server setup encountered an error.
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Commented:
Are you using a administrator account that is a member of the schema master group?

Author

Commented:
Yes, the account is a member of Schema Admins

Author

Commented:
Enterprise Admins too...
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Commented:
Is there any more details inside the ExchangeSetup.log?
Commented:
And you're executing this from a machine in the same AD site as the DC which is the Schema Master?
Commented:
You may want to even run it from a domain controller...

Author

Commented:
I think I figured it out. Exchange 2003 was here before. Had to whack a couple of legacy Security Groups.

http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/1d60594e-af05-411f-9144-b20f9d161547

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