AD pass through to Openladp?

[Justin Stanczak]

Is there a method of connecting Active Directory to use OpenLDAP as the
authentication source. So pass through to OpenLDAP. Making OpenLDAP the
primary system with all the passwords and usernames. I realize this might
be more of a AD question, but the places I've looked seem to always make AD
the primary. Then everyone else must proxy to AD. Thanks.