What happens to existing Horde Webmail instances after its removal from Plesk in April 2025?

As of April 2025 (Plesk Obsidian version 18.0.69), Horde webmail is no longer installable or supported in Plesk, still, existing Horde installations are not automatically uninstalled and may still function, though their reliability is not guaranteed.

Users with existing Horde instances can continue using them at their own risk and no automatic migration to another webmail client (e.g., Roundcube) will occur.