Календари. Exchange на корпортале.

$arFieldsCalend = array(
    "DATE_FROM" => $dateTimeFrom,
    "CAL_TYPE" => 'user',
    "NAME" => "Встреча",
    "DESCRIPTION" => "Встреча назначена автоматически, системой управления",
    "SKIP_TIME" => false,
    "IS_MEETING" => false,
    "RRULE" => false,
    "REMIND" => array(
        ['type' => 'hour', 'count' => 1]
    ),
);
$arFieldsCalend["OWNER_ID"] = $userId;

CCalendar::SaveEvent(
    array(
        'arFields' => $arFieldsCalend,
        'autoDetectSection' => true
    )
);