aptitude install imp4 ingo1 turba2 kronolith2 nag2 mnemo2
touch /etc/horde/horde3/conf.bak.php
touch /etc/horde/imp4/conf.bak.php
touch /var/log/horde/horde3.log
chmod 777 /etc/horde/*/conf.{php,bak.php}
chown root.www-data /var/log/horde/horde3.log
chmod 770 /var/log/horde/horde3.log

Vhost config: /etc/apache2/sites-available/webmail:

<VirtualHost _default_:443>
ServerName webmail.example.com
ServerAlias webmail.*

Alias /horde3 /usr/share/horde3
Alias /Microsoft-Server-ActiveSync /usr/share/horde3/rpc.php
DocumentRoot /usr/share/horde3
<Directory /usr/share/horde3>
    Options FollowSymLinks
    AllowOverride Limit
</Directory>
<Files ~ "\.(inc|bak)$">
    deny from all
</Files>
SSLEngine on 
</VirtualHost>

Die 2. und 3. Zeile aus /etc/horde/horde3/conf.php löschen

Im Browser „<SERVERIP>/horde3/“ öffnen

Administration→Database mysql einstellen und Zugangsdaten eingeben

In /etc/horde/horde3/registry.php den Abschnitt „imp4“ aktivieren:

...
$this->applications['imp'] = array(
    'fileroot' => '/usr/share/horde3/lib' . '/../imp',
    'webroot' => $this->applications['horde']['webroot'] . '/imp',
    'name' => _("Mail"),
    'status' => 'active',
    'provides' => array('mail', 'contacts/favouriteRecipients')
);
...

Unter /etc/horde/imp4/servers.php den gewünschten IMAP Server einstellen und den Rest der Beispielconfig weglöschen:

...
$servers['imap'] = array(
    'name' => 'IMAP Server',
    'server' => '<IMAPSERVER>',
    'hordeauth' => false,
    'protocol' => 'imap/notls',
    'port' => 143,
    'maildomain' => '', 
    'smtphost' => '<SMTPSERVER>',
    'smtpport' => 25, 
    'realm' => '', 
    'preferred' => '', 
);
...

Horde und IMP Config festmachen:

chmod 644 /etc/horde/*/conf.{php,bak.php}

/etc/horde/imp4/trailer.txt evtl. verändern.

Ingo DB:

mysql-u root -p horde < /usr/share/doc/ingo1/examples/scripts/sql/ingo.sql

Turba DB:

mysql -u root -p horde < /usr/share/doc/turba2/examples/scripts/sql/turba.sql

Kronolith DB:

mysql-u root -p horde < /usr/share/doc/kronolith2/examples/scripts/sql/kronolith.mysql.sql

Nag DB:

mysql-u root -p horde < /usr/share/doc/nag2/examples/scripts/sql/nag.sql