In placemigration of W2K SP4 to 2008 fails with the enclosed errors.tia================================================== ==========================="attributeId" attribute value for objects defined in Windows 2000 schema and extended schema do not match.A previous schema extension has defined the attribute value as "1.2.840.113556.1.8000.2554.40355.27805.7899.19560 .45164.2719068.8312222.1.1" for object "CN=departmentNumber,CN=Schema,CN=Configuration,DC =business,DC=com" differently than the schema extension needed for Windows Server 2008.[Status/Consequence]Adprep cannot extend your existing schema[User Action]Contact the vendor of the application that previously extended the schema to resolve the inconsistency. Then run adprep again.================================================== ==========================="isSingleValued" attribute value for objects defined in Windows 2000 schema and extended schema do notmatch.A previous schema extension has defined the attribute value as "TRUE" for object "CN=departmentNumber,CN=Schema,CN=Configuration,DC=business,DC=com" differently than the schema extension needed for Windows Server 2008.[Status/Consequence]Adprep cannot extend your existing schema[User Action]Contact the vendor of the application that previously extended the schema to resolve the inconsistency. Then run adprep again.

Sadly Schema Extension is a one way road. if you have only those two errors, you could change the values from TRUE to FALSE with ADSIedit and then rerun adprep.

Hi ibRasman,Please try the Maurizio's suggestion first, if the issue continues, you may try add the following registry value on the schema master.HKLM\system\CurrentControlSet\Services\NTDS\ParametersValue Name: Schema Update AllowedValue Type: REG_DWORDValue Data:1Rerun ADPREP /FORESTPREP. Does it work now? Please remember to remove the "Schema Update Allowed" registry value when finished.Regards,Wilson JiaThis posting is provided "AS IS" with no warranties, and confers no rights.

Thanks for your comments, As it turns the resolution is not published and was resolved by contacting \ea