Does anyone have a valid and working example of OpenLDAP meta backend?

I have been Google'ing my fingers off and simply can not find a working example of how to merge/proxy a OpenLDAP server and windows AD server. Have anyone worked with this before? Any suggestions would be appreciated.

The idea is simple:

openldap.mydomain.local ----> Linux LDAP Server

winad.mydomain.local ----> Windows AD Server

Some users are one Linux and some on WinAD. OpenLDAP should search both on login. A working example would be appreciated.

From serverfault QXT

• Try this one and follow the discussions.

  http://blog.scottlowe.org/2007/01/15/linux-ad-integration-version-4/

  Maybe you could try samba4, that should give much more integration with AD.
  It's still in alpha stage, but you could try it anyway.

  From Pier

• You'll find one here: http://blog.sejo.be/2010/01/8/openldap-en-3-ad-servers/

  From Jonathan Clarke