Explanation/Reference:
Explanation:
Access-based enumeration is only supported on a Domain-based Namespace in Windows Server 2008 Mode. This type of Namespace requires a minimum Windows Server 2003 forest functional level and a minimum Windows Server 2008 domain functional level.
The exhibit indicates that the current namespace is a Domain-based Namespace in Windows Server 2000 Mode. To migrate a domain-based namespace from Windows 2000 Server mode to Windows Server 2008 mode, you must export the namespace to a file, delete the namespace, recreate it in Windows Server 2008 mode, and then import the namespace settings.
Reference:
http://msdn.microsoft.com/en-us/library/cc770287.aspx
http://msdn.microsoft.com/en-us/library/cc753875.aspx