function wpupdate_cron()
{
    include 'includes/wp-update-class.php';
    include 'includes/wp-update-functions.php';
    $wpupdate = new WP_Update();
    $plugins = wpupdate_get_plugins();
    foreach ((array) $plugins as $plugin_file => $plugin_info) {
        $result = $wpupdate->checkPluginUpdate($plugin_file, false, false);
        if (is_array($result['Errors']) && in_array('Not Cached', $result['Errors'])) {
            //We want to force an update on this item
            $result = $wpupdate->checkPluginUpdate($plugin_file, true, true);
        }
    }
    //Now that we've updated every plugins details, we want to update the notices, this will also have the effect of sending the email if theres new updates.
    $wpupdate->updateNotifications();
}