Why 'Sasser' does not affect Win2003

As you may be aware, a new worm has emerged named, 'Sasser', and Windows Server 2003 is not infected. Why? Because the RPC interface, which is accessible to anyone (ie; anonymous) on Windows XP and Win2000, was changed in Win2003 so that it requires a local admin to access. Not a remote admin, a local admin using the server's keyboard.