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What is Horde?


The Horde Project is a group of developers who write web applications using the Horde Application Framework, itself a product of the project.

The Horde Application Framework is a flexible, modular, general-purpose web application framework written in PHP. It provides an extensive array of components that are targeted at the common problems and tasks involved in developing modern web applications: libraries for dealing with preferences, compression, browser detection, connection tracking, MIME, and more.

The Horde Framework, by itself, does not provide any significant end user functionality; it provides a base for other applications and tools for developers. You will probably want to install some of the available Horde applications, such as IMP (a webmail client), or Kronolith (a calendar). There is a list of Horde applications and projects at

This software is OSI Certified Open Source Software. OSI Certified is a certification mark of the Open Source Initiative.

1   Obtaining Horde

Further information on Horde and the latest version can be obtained at

Information on applications that use the Horde framework can be found at

2   Documentation

The following documentation is available in the Horde distribution:

README:This file
COPYING:Copyright and license information
docs/CHANGES:Changes by release
 Coding standards for Horde projects
 How to contribute to Horde
docs/CREDITS:Project developers
docs/INSTALL:Installation instructions and notes
 Performance guide
docs/RELEASE:Release process notes
docs/SECURITY:Security notes
docs/UPGRADING:Pointers on upgrading from previous Horde versions

3   Installation

Instructions for installing Horde can be found in the file INSTALL in the docs/ directory of the Horde distribution.

4   Assistance

If you encounter problems with Horde, help is available!

The Horde Frequently Asked Questions List (FAQ), available on the Web at

Horde LLC runs a number of mailing lists, for individual applications and for issues relating to the project as a whole. Information, archives, and subscription information can be found at

Lastly, Horde developers, contributors and users also make occasional appearances on IRC, on the channel #horde on the Freenode Network (

5   Licensing

For licensing and copyright information, please see the file COPYING in the Horde distribution.


The Horde team