One sign on gets you into your Active Directory which uses Microsoft Active Directory Identity Management. Single sign on means users log into the network with one username and password to access all of the systems and applications available to them. Microsoft Active Directory also allows companies to centrally manage and share user information. Epazz user management, or LDAP easily integrates with Active Directory. In addition, Active Directory can be used to store user mapping information, user access protocols, and customized features all within your corporate intranet.