Bigger organizations tend to deploy a directory server for user management. Lightweight Directory Protocol (LDAP) is the most widely used standard for maintaining distributed directory information services over an Internet Protocol (IP) network. OpenLDAP and Active Directory are widely used implementations of LDAP, and we are going to integrate them with ownCloud. We will see how the implementation of OpenLDAP can be configured on a bare CentOS. We will also setup basic Active Directory on Windows Server 2008, and we will integrate them both with ownCloud. Digging into intricacies of OpenLDAP and Active Directory is not feasible for this book, but we'll walk through a basic setup.