The cPanel team has announced important changes for the cPanel/WHM Control Panel.
The Horde webmail application requires PHP version 7.4, which will reach end-of-life on November 28, 2022. Because of this, cPanel team decided to remove Horde webmail application from cPanel/WHM Control Panel.
All Horde email, contacts, and calendars are automatically migrated to Roundcube.
Roundcube then becomes the default webmail application.