That's fair, there's a bunch of LDAP at the large organisation I work for - and yes even if in some cases the technology today no longer has any idea it's descended from an X.500 system it's very obvious when you see O=Foo OU=Bar that we're looking at the exact same directory concept.

I was thinking about the global directory rather than individual local X.500 instances but I didn't say that explicitly and I should have.