Configuring Microsoft Exchange Server

•      I'm having an issue getting Exchange 2010 installed for one of my clients. First a bit about our environment:
Active Directory was recently extended to 2008 with one 2008 R2 DC running. So we're still in 2003 compatible mode at the domain and forest levels. We have never had Exchange installed here; so this is a brand new install. The Exchange server is in the same AD site as all the FSMO role holders.
We're installing Exchange 2010 on a Windows Server 2008 R2, Standard edition server just provisioned for this purpose.
I've done dozens of Exchange installs for other clients. First time I've gotten hung up on extending the schema.
I tried running the Exchange wizard, but it failed during the "Prepare the Organization" phase. So I tried running the setup.com file from a command prompt. I've tried it from the Exchange server and from the 2008 DC (Schema Master and PDC Emulator). In each case, I get the following error:

Configuring Microsoft Exchange Server
Organization Preparation ......................... FAILED
The following error was generated when "$error.Clear(); install-ExchangeSchema -LdapFileName ($roleInstallPath + "Setup\Data\"+$RoleSchemaPrefix + "schema92.ldf")" was run: "There was an error while running 'ldifde.exe' to import the schema file 'C:\Windows\Temp\ExchangeSetup\Setup\Data\schema92.ldf'. The error code is: 8202. More details can be found in the error file: 'C:\Users\KXknarr\AppData\Local\Temp\ldif.err'".
The Exchange Server setup operation did not complete. Visit http://support.microsoft.com and enter the Error ID to find more information.
Exchange Server setup encountered an error.

The details in the ldif.err file are:

Entry DN: CN=ms-Exch-Client-Access-Array,CN=Schema,CN=Configuration,DC=ad,DC=pgcc,DC=edu
Add error on entry starting on line 730: No Such Attribute
The server side error is: 0x57 The parameter is incorrect.
The extended server error is:
00000057: LdapErr: DSID-0C090C3E, comment: Error in attribute conversion operation, data 0, v1db1
An error has occurred in the program

The section of schema92.ldf that it is talking about is:

dn: CN=ms-Exch-Client-Access-Array,<SchemaContainerDN>
changetype: ntdsSchemaAdd
adminDescription: ms-Exch-Client-Access-Array
adminDisplayName: ms-Exch-Client-Access-Array
defaultSecurityDescriptor: D:S:
governsID: 1.2.840.113556.1.5.7000.62.50145
lDAPDisplayName: msExchClientAccessArray
name: ms-Exch-Client-Access-Array
objectCategory: CN=Class-Schema,<SchemaContainerDN>
objectClass: classSchema
objectClassCategory: 1
rDNAttID: cn
schemaIdGuid:: 6VHo0Om020y1HNHtQ6g2ug==
subClassOf: top
auxiliaryClass: msExchBaseClass
possSuperiors: msExchContainer
mayContain: legacyExchangeDN
mayContain: msExchServerSite
mayContain: networkAddress

I can't get any further. All other steps are being blocked by this error. Anyone have any suggestions?


Don’t suppose anyone has ever seen anything like this?