Applicable to:
- Plesk for Linux
- Plesk for Windows
Question
What happens to existing Horde instances, and do users need to manually switch to another webmail client like Roundcube to maintain webmail access?
Answer
Horde Webmail was deprecated in Plesk Obsidian 18.0.64. As of April 2025 (Plesk Obsidian 18.0.69), Horde webmail is no longer installable or supported in Plesk. Existing Horde installations are not removed automatically and stay in place, but they are no longer maintained and receive no updates, security fixes, or technical support.
No automatic migration to another webmail client (for example, Roundcube) occurs. Existing Horde instances can still be used at your own risk, but we strongly recommend switching to a different webmail client: How to change webmail for a domain / all domains in Plesk.
Starting from Plesk Obsidian 18.0.82, on servers where Horde is installed, a warning is shown to the administrator after every Plesk update (excluding hotfixes), the first time they log in to Plesk.
Comments
It would be more helpful to outline steps required to safely transition servers off Horde onto Roundcube.
For example outlining considerations such as data that might be stored within Horde (contacts, calendar events etc.); how to identify if any exist and avoid accidentally losing them, and the corresponding CLI commands to bulk switch all sites currently using Horde to Roundcube.
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