Horde (software)
open-source web-mail
Horde is a free web-based groupware. The components of this groupware rest on the Horde framework, a PHP-based framework provides all the elements required for rapid web application development. Horde offers applications such as the Horde IMP email client, a groupware package (calendar, notes, tasks, file manager), a wiki and a time and task tracking software.
History
The Horde framework evolved from the IMP (Internet Messaging Project) webmail that Chuck Hagenbuch published on Freshmeat in 1998. A constant stream of feature requests not all fitting for a webmail application led to the development of a more generic web application backbone: the Horde framework. The first announcement on Freshmeat was version 1.3.3 at the beginning of 2001. The release of Horde 2.0 and IMP 3.0 was the first one with two truly separate components. In late 2001, the Chora CVS frontend was adopted by PHP as their repository viewer and released as another standalone component in 2002. The Nag task manager, Nnemo note taker, the Turba contacts manager and Kronolith calendar were also all first released throughout 2002.
The early releases of IMP saw adoption across the world as the primary webmail interface for users, with some deployments exceeding hundreds of thousands of users.
“Horde (software)” enters the record as open-source web-mail. Crown Archives preserves that source wording while asking what Horde, software and open-source can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Mar 21, 2026. The linked authority identifier is Q1423806. 1 of 1 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1998, 2001 and 2002.
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This entry incorporates text from “Horde (software)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.