https://www.codeenigma.com/community/blog/connecting-your-drupal-site-microsoft-active-directory-server
http://www.rackspace.com/knowledge_center/article/installing-active-directory-domain-services-on-windows-server-2008-r2-enterprise-64-bit
http://stackoverflow.com/questions/12339784/how-to-connect-active-directory-records-from-drupal-7
https://www.drupal.org/project/ldap_sso
https://www.drupal.org/node/2079839
https://www.drupal.org/node/997082
http://drupal.stackexchange.com/questions/3833/drupal-authentication-with-activedirectory
https://www.icts.uiowa.edu/confluence/display/ICTSit/Drupal+LDAP+Integration+Against+Active+Directory