How to change the welcome message in Horde IMP ?
Welcome to Horde to
Welcome to WhatEverYouWant in Plesk 7.5.3 and in newer versions you need to redefine the
name variable in the /usr/share/psa-horde/config/registry.php file.
By default it's defined as follows:
'name' => _("Horde"),
Note: In older Plesk versions (prior to 7.5) the file is $HTTPD_VHOSTS_D/webmail/horde/config/registry.php.