The following information is provided by cPanel in their forums at: https://forums.cpanel.net/threads/horde-removal-in-version-108.703749/
Horde support will be removed from cPanel & WHM starting with Version 108. This is because Horde does not support PHP 8.x, and PHP 7.4 reaches End of Life in November 2022.
Our Webmail offering will be focused on Roundcube going forward. Your email will be available in Roundcube just as it is in Horde today.
Nothing currently. We are currently working on tools that will migrate current Horde calendar and contacts data to Roundcube and Roundcube + CCS. We will have more information available once those tools are ready.
We will be providing migration tools that will help Horde users move to Roundcube. We will have more information on those at a later date.
Thursday, August 25, 2022