Yes and yes i know that and my mail.inc.php is OK
$rcmail_config['plugins'] = array(
additional_message_headers,
archive,
automatic_addressbook,
calendar,
#calendar_switch,
contextmenu,
copymessage,
folderbuttons,
forwardattachment,
globaladdressbook,
jquery,
#managesieve,
markasjunk2,
#moreuserinfo,
password,
sieverules,
sticky_notes,
vcard_attach,
zipdownload
);