* [http://www.techworld.com.au/article/342104/horde_open_source_groupware_preps_version_4_release Tech World: Horde open source groupware preps version 4 release] - Interview with Jan Schneider, April 2010 * [http://www.linux-tip.net/cms/content/view/332/26/ Linux Tip: Installing Horde Groupware Webmail Edition] - December 2007 * [http://www.linux-mag.com/id/1777 Linux Magazine: Web-based Email on the Horde Platform] - October 2004