Horde (software)

Horde is a free, web-based groupware.

The various components of this groupware are based on the Horde Framework. This is written in PHP Framework provides all the elements for the rapid development of web applications.

The Horde Project has made ​​it its mission to provide the broadest possible support for backends. So Horde with various SQL dialects can be just treated like LDAP and Kolab. Horde supports NoSQL databases like CouchDB and the CalDAV protocol for calendar data. While standard settings using supplied command line scripts or buttons in the admin screen can be created very quickly, there are numerous configuration options and special features that are set up in some cases considerably more complex. A degree of understanding of the underlying technology is required in these cases.

  • 3.1 Webmail Edition


Horde is clear from the Webmail IMP ( Internet Messaging Program), which was programmed by Chuck Hagenbuch in the summer of 1998 for his campus. As a starting point for this was the IMAP extension of PHP. After IMP was presented at Freshmeat, there were many extension requests. Not all of these requests were specific for webmail, so Horde was written as a superstructure. Horde should include all the extensions that did not fit to IMP.

  • IMP 1.0 was presented on 23 July 1998 on Freshmeat. At this time consisted IMP from a single PHP file with three functions.
  • On 10 January 2001 Horde is registered as a separate project on Freshmeat.
  • Horde 2.0 and IMP 3.0 were completed in 2001. Horde 2.0 was the first version that can be run without IMP. Horde was now under LGPL
  • On 23 December 2003 Horde 3.0 has been released. The number of Horde modules increased from 6 to 45 Horde since this release uses a PEAR -like package management system for its software libraries.
  • On October 30, 2012 Horde appeared 5


Horde offers diverse treatments in the form of modules. They are divided mainly in:



Development Tools

Horde Groupware

To facilitate the installation and maintenance of horde, horde - base system as well as the current versions of the modules Kronolith, Turba, Nag and mnemonic offered as a bundle with the title Horde Groupware as a single downloadable archive of already partially finished configurations. On 14 January 2007, the first of these bundles appeared. The current version is 5.1.1 on 16 July 2013.

Webmail Edition

Since the IMP webmail is one of the most popular Horde applications, there is another bundle under the title Horde Groupware Webmail Edition, which contains the same modules as the above bundle, and has also expanded to IMP and Ingo. The first version was released simultaneously with the normal, the current version is 5.1.1 on July 16, 2013

The development team

The constant Horde developer team is currently composed of:

  • Chuck Hagenbuch
  • Jan Schneider
  • Michael M. Slusarz
  • Ben Chavet
  • Michael Rubinsky
  • Ralf Lang

Former Developer:

  • Jon Parise
  • Anil Madhavapeddy
  • Rich Lafferty
  • Marcus I. Ryan
  • Jason E. Felice
  • Matt Selsky
  • Eric Rostetter


The webmail module IMP

Hordes address management

Administration of rules for filtering emails