• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
    If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
  • We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.

Plesk 10.3.1 How to Update Horde 3 -> 4

It should be possible if you install horde and configurate it yourself. (Configuration with Qmail will be the worst thing i think)
After that u should ve a Webmailer Gui, which u can connect with a DNS Record to that Subdomain.

This is the theory ;)
 
I think that Plesk will not found your custom unsupported Horde installation and as result Horde will not be integrated to Plesk interface.


How can i install the new horde 4 version?

pear install -a horde/webmail

But got later these error: PHP Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 32 bytes) in /usr/share/php/PEAR/PackageFile/Parser/v2.php on line 65

i updatet my php.ini to 512M but no changing effect
 
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