Some of IMP's configuration files are missing:
conf.php	This is the main IMP configuration file. It contains paths and options for the IMP scripts.
html.php	This file controls the stylesheet that is used to set colors and fonts in addition to or overriding Horde defaults.
mime_drivers.php	This file controls local MIME drivers for IMP, specifically what kinds of attachments are viewable and/or downloadable.
prefs.php	This file controls the default preferences for IMP, and also controls which preferences users can alter.
servers.php	This file controls the default settings for IMP, and also defines the list of available servers if you are using the server list.