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|This article relies on references to primary sources. (January 2012)|
|Developer(s)||The Horde Core Team|
|Stable release||H4 (5.0.23) (July 21, 2012[±])|
|Available in||English, German and many others (multilingual)|
|License||GNU General Public License|
Chuck Hagenbuch published a first version of IMP 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 release of IMP 3.0 and Horde 2.0 was the first one with two truly separate components. Since then any deployment of IMP can only run on top of a Horde installation.
SAPO uses IMP to provide several million users with a webmail platform. The company also sponsored the initial development of the dynamic AJAX variant of IMP which was released as a separate package - named DIMP - with the release of Horde 3.2.
Support for mobile clients was provided within 2006 for the first time. At that time a WAP based mobile view was provided by a separate package called MIMP.
See also 
- "Horde localization". www.horde.org. Retrieved 2012-01-31.
- "Horde case study". www.horde.org. Retrieved 2012-01-21.
- "Horde-2.0 release". marc.info. Retrieved 2012-01-21.
- "Horde powering portugalmail.pt". codebits.eu. Retrieved 2012-01-21.
- "Horde developer supports SAPO". janschneider.de. Retrieved 2012-01-21.
- "SAPO sponsors dynamic webmail". janschneider.de. Retrieved 2012-01-31.
- "Horde 3.2 and DIMP 1.0 release". janschneider.de. Retrieved 2012-01-31.
- "Development of DIMP 1.0". phpmagazine.net. Retrieved 2012-02-01.
- "MIMP 1.0 release". horde.org. Retrieved 2012-01-31.
- "Development of the Horde smartphone views". log.pardus.de. Retrieved 2012-01-31.
- "News coverage of the Horde smartphone views". techworld.com.au. Retrieved 2012-02-01.
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