The Horde Project

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As the most flexible groupware platform in the world, Horde makes an ideal place to create your own custom applications. Learn more about our feature-rich collection of web development libraries and how to get started.
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Latest News

Planet Horde

The next IMP goes IMAP4rev2 and Oauth
The Horde Project released Horde 6 and IMP 7 a few months ago. It came with all the rough edges, latches for features already prototyped, unfinished work and notably it came wit...
IMP 7 – The first release in years, the first CVE in a day – and a fix
The life of a security-conscious open source project can be summed up quite nicely by the last two days of the Horde project. On 2026-06-30, the Horde team announced the General...
Cache Cache – Wicked Whupsie
Why did a wicked wiki page take seconds to load when nobody was editing it? Why did a whups ticket report recalculate the same numbers over and over again even though nothing ha...
A Little Bit of SOAP…
SOAP – Simple Object Access Protocol was born at the turn of the millennium when XML-RPC turned out to be not quite enough for the web’s growing need for integration...
Another wicked game in the engine room
It was the early 2000s when the web was still glowing and deforming, freshly spit out from a volcano at CERN a mere decade earlier, taking its time cooling down and gelling into...
Worms infested my code base and I am fighting back
The sabberworm/php-css-parser used to be bundled with the horde/css-parser library. Supposedly the one is a shield before the other, separating the code base from this particula...
Time, it needs time
As I am writing this, bug reports from users are coming in on last night’s updates to Turba Addressbook. In Turba we first rolled out our new way of date handling and upgr...
Intermission: H6 Beta Update Week
I hesitated the whole last week to release part 4 of our series on Horde 6 architecture decisions since there was a lot going on. The good news is you don’t have another l...
Web: Why “No Frontend Framework” is the Right Framework for Horde 6
Part 3 of 4: Architectural Evolution in Horde 6 I really did not want to build another frontend framework. Or adopt one for that matter. When jQuery Mobile became untenable (see...
JWT Authentication: Building a Hybrid Model That Actually Works
Part 2 of 4: Architectural Evolution in Horde 6 In part 1 of the evolution series: The jQuery Problem I discussed frontend concerns – How to move off a dead mobile-only fr...