Views RSS How to sort by updated date in Outlook

Dear Drupal community,

I'm trying to setup a RSS feed for a knowledge base named "Product lines".
I've created a Book to organize the different pages.
My issue is that I'd like the RSS feed to gather every update of a page and every new page.
It works fine using a view (see view settings below), with a relationship to the book top node.

The only remaining problem is the sort. Using Outlook as the RSS reader, it uses "pubDate" to sort the RSS entries.
So when I update a page, it shows as unread in Outlook but not at the most recent item.
This is confusing for the users, they expect a new RSS entry for each update.

I've tried to use RSS Field, and it worked, replacing "pubDate" with "lastBuildDate" in the core item field.
The issue with this solution is that I can't find a way to display the full content in the RSS field.

Any help would be appreciated.

Thanks,
Jeremy

The export views:
- I use aggregation to avoid duplicate entries if there are several updates in a row (I hope this is the good way to do it)
- I've added a small html code in the header to display the RSS icon at the top of the page.

$view = new view;
$view->name = 'product_line_news';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'Product Line News';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'Product Line News';
$handler->display->display_options['group_by'] = TRUE;
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['query']['options']['query_comment'] = FALSE;
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['pager']['options']['items_per_page'] = '10';
$handler->display->display_options['style_plugin'] = 'table';
$handler->display->display_options['style_options']['columns'] = array(
  'title' => 'title',
);
$handler->display->display_options['style_options']['default'] = '-1';
$handler->display->display_options['style_options']['info'] = array(
  'title' => array(
    'sortable' => 0,
    'default_sort_order' => 'asc',
    'align' => '',
    'separator' => '',
    'empty_column' => 0,
  ),
);
$handler->display->display_options['style_options']['override'] = 1;
$handler->display->display_options['style_options']['sticky'] = 0;
$handler->display->display_options['style_options']['empty_table'] = 0;
/* Header: Global: Text area */
$handler->display->display_options['header']['area']['id'] = 'area';
$handler->display->display_options['header']['area']['table'] = 'views';
$handler->display->display_options['header']['area']['field'] = 'area';
$handler->display->display_options['header']['area']['label'] = 'Subscribe';
$handler->display->display_options['header']['area']['empty'] = TRUE;
$handler->display->display_options['header']['area']['content'] = '<a href="http://product.example.com/?q=product-line-news.xml" class="feed-icon" title="Subscribe to Product Line News"><img typeof="foaf:Image" src="http://product.example.com/misc/feed.png" width="16" height="16" alt="Subscribe to Product Line News"></a>
';
$handler->display->display_options['header']['area']['format'] = 'full_html';
$handler->display->display_options['header']['area']['tokenize'] = 0;
/* Relationship: Book: Top level book */
$handler->display->display_options['relationships']['bid']['id'] = 'bid';
$handler->display->display_options['relationships']['bid']['table'] = 'book';
$handler->display->display_options['relationships']['bid']['field'] = 'bid';
$handler->display->display_options['relationships']['bid']['required'] = 0;
/* Relationship: Content: Author */
$handler->display->display_options['relationships']['uid']['id'] = 'uid';
$handler->display->display_options['relationships']['uid']['table'] = 'node';
$handler->display->display_options['relationships']['uid']['field'] = 'uid';
$handler->display->display_options['relationships']['uid']['required'] = 0;
/* Field: Content: Post date */
$handler->display->display_options['fields']['created']['id'] = 'created';
$handler->display->display_options['fields']['created']['table'] = 'node';
$handler->display->display_options['fields']['created']['field'] = 'created';
$handler->display->display_options['fields']['created']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['created']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['created']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['created']['alter']['external'] = 0;
$handler->display->display_options['fields']['created']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['created']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['created']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['created']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['created']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['created']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['created']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['created']['alter']['trim'] = 0;
$handler->display->display_options['fields']['created']['alter']['html'] = 0;
$handler->display->display_options['fields']['created']['element_label_colon'] = 1;
$handler->display->display_options['fields']['created']['element_default_classes'] = 1;
$handler->display->display_options['fields']['created']['hide_empty'] = 0;
$handler->display->display_options['fields']['created']['empty_zero'] = 0;
$handler->display->display_options['fields']['created']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['created']['date_format'] = 'custom';
$handler->display->display_options['fields']['created']['custom_date_format'] = 'r';
/* Field: Content: Updated date */
$handler->display->display_options['fields']['changed']['id'] = 'changed';
$handler->display->display_options['fields']['changed']['table'] = 'node';
$handler->display->display_options['fields']['changed']['field'] = 'changed';
$handler->display->display_options['fields']['changed']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['changed']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['changed']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['changed']['alter']['external'] = 0;
$handler->display->display_options['fields']['changed']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['changed']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['changed']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['changed']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['changed']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['changed']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['changed']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['changed']['alter']['trim'] = 0;
$handler->display->display_options['fields']['changed']['alter']['html'] = 0;
$handler->display->display_options['fields']['changed']['element_label_colon'] = 1;
$handler->display->display_options['fields']['changed']['element_default_classes'] = 1;
$handler->display->display_options['fields']['changed']['hide_empty'] = 0;
$handler->display->display_options['fields']['changed']['empty_zero'] = 0;
$handler->display->display_options['fields']['changed']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['changed']['date_format'] = 'long';
/* Field: Content: Body */
$handler->display->display_options['fields']['body']['id'] = 'body';
$handler->display->display_options['fields']['body']['table'] = 'field_data_body';
$handler->display->display_options['fields']['body']['field'] = 'body';
$handler->display->display_options['fields']['body']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['body']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['body']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['body']['alter']['external'] = 0;
$handler->display->display_options['fields']['body']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['body']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['body']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['body']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['body']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['body']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['body']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['body']['alter']['trim'] = 0;
$handler->display->display_options['fields']['body']['alter']['html'] = 0;
$handler->display->display_options['fields']['body']['element_label_colon'] = 1;
$handler->display->display_options['fields']['body']['element_default_classes'] = 1;
$handler->display->display_options['fields']['body']['hide_empty'] = 0;
$handler->display->display_options['fields']['body']['empty_zero'] = 0;
$handler->display->display_options['fields']['body']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['body']['field_api_classes'] = 0;
/* Field: Content: Link */
$handler->display->display_options['fields']['view_node']['id'] = 'view_node';
$handler->display->display_options['fields']['view_node']['table'] = 'views_entity_node';
$handler->display->display_options['fields']['view_node']['field'] = 'view_node';
$handler->display->display_options['fields']['view_node']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['view_node']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['view_node']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['trim'] = 0;
$handler->display->display_options['fields']['view_node']['alter']['html'] = 0;
$handler->display->display_options['fields']['view_node']['element_label_colon'] = 1;
$handler->display->display_options['fields']['view_node']['element_default_classes'] = 1;
$handler->display->display_options['fields']['view_node']['hide_empty'] = 0;
$handler->display->display_options['fields']['view_node']['empty_zero'] = 0;
$handler->display->display_options['fields']['view_node']['hide_alter_empty'] = 1;
/* Field: Content: Path */
$handler->display->display_options['fields']['path']['id'] = 'path';
$handler->display->display_options['fields']['path']['table'] = 'node';
$handler->display->display_options['fields']['path']['field'] = 'path';
$handler->display->display_options['fields']['path']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['path']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['path']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['path']['alter']['external'] = 0;
$handler->display->display_options['fields']['path']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['path']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['path']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['path']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['path']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['path']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['path']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['path']['alter']['trim'] = 0;
$handler->display->display_options['fields']['path']['alter']['html'] = 0;
$handler->display->display_options['fields']['path']['element_label_colon'] = 1;
$handler->display->display_options['fields']['path']['element_default_classes'] = 1;
$handler->display->display_options['fields']['path']['hide_empty'] = 0;
$handler->display->display_options['fields']['path']['empty_zero'] = 0;
$handler->display->display_options['fields']['path']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['path']['absolute'] = 1;
/* Field: Content: Title */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['title']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['title']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['title']['alter']['external'] = 0;
$handler->display->display_options['fields']['title']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['title']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['title']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['title']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['title']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['title']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['title']['alter']['strip_tags'] = 1;
$handler->display->display_options['fields']['title']['alter']['trim'] = 0;
$handler->display->display_options['fields']['title']['alter']['html'] = 0;
$handler->display->display_options['fields']['title']['element_label_colon'] = 1;
$handler->display->display_options['fields']['title']['element_default_classes'] = 1;
$handler->display->display_options['fields']['title']['hide_empty'] = 0;
$handler->display->display_options['fields']['title']['empty_zero'] = 0;
$handler->display->display_options['fields']['title']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['title']['link_to_node'] = 0;
/* Field: User: E-mail */
$handler->display->display_options['fields']['mail']['id'] = 'mail';
$handler->display->display_options['fields']['mail']['table'] = 'users';
$handler->display->display_options['fields']['mail']['field'] = 'mail';
$handler->display->display_options['fields']['mail']['relationship'] = 'uid';
$handler->display->display_options['fields']['mail']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['mail']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['mail']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['mail']['alter']['external'] = 0;
$handler->display->display_options['fields']['mail']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['mail']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['mail']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['mail']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['mail']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['mail']['alter']['more_link'] = 0;
$handler->display->display_options['fields']['mail']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['mail']['alter']['trim'] = 0;
$handler->display->display_options['fields']['mail']['alter']['html'] = 0;
$handler->display->display_options['fields']['mail']['element_label_colon'] = 1;
$handler->display->display_options['fields']['mail']['element_default_classes'] = 1;
$handler->display->display_options['fields']['mail']['hide_empty'] = 0;
$handler->display->display_options['fields']['mail']['empty_zero'] = 0;
$handler->display->display_options['fields']['mail']['hide_alter_empty'] = 1;
$handler->display->display_options['fields']['mail']['rss_format'] = 'with_name';
/* Sort criterion: Content: Updated date */
$handler->display->display_options['sorts']['changed']['id'] = 'changed';
$handler->display->display_options['sorts']['changed']['table'] = 'node';
$handler->display->display_options['sorts']['changed']['field'] = 'changed';
$handler->display->display_options['sorts']['changed']['order'] = 'DESC';
/* Sort criterion: Content: Post date */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
/* Filter criterion: Content: Published */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 1;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Content: Nid */
$handler->display->display_options['filters']['nid']['id'] = 'nid';
$handler->display->display_options['filters']['nid']['table'] = 'node';
$handler->display->display_options['filters']['nid']['field'] = 'nid';
$handler->display->display_options['filters']['nid']['relationship'] = 'bid';
$handler->display->display_options['filters']['nid']['value']['value'] = '81';
/* Filter criterion: Content: Has new content */
$handler->display->display_options['filters']['timestamp']['id'] = 'timestamp';
$handler->display->display_options['filters']['timestamp']['table'] = 'history';
$handler->display->display_options['filters']['timestamp']['field'] = 'timestamp';

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page');
$handler->display->display_options['path'] = 'product-line-news';
$handler->display->display_options['menu']['title'] = 'Product Line News';
$handler->display->display_options['menu']['weight'] = '0';
$handler->display->display_options['menu']['context'] = 0;

/* Display: Feed */
$handler = $view->new_display('feed', 'Feed', 'feed');
$handler->display->display_options['pager']['type'] = 'none';
$handler->display->display_options['pager']['options']['offset'] = '0';
$handler->display->display_options['style_plugin'] = 'rss';
$handler->display->display_options['style_options']['description'] = 'Product Lines updates';
$handler->display->display_options['row_plugin'] = 'node_rss';
$handler->display->display_options['row_options']['item_length'] = 'full';
$handler->display->display_options['row_options']['links'] = 0;
$handler->display->display_options['path'] = 'product-line-news.xml';
$handler->display->display_options['displays'] = array(
  'default' => 'default',
  'page' => 'page',
);
$translatables['product_line_news'] = array(
  t('Master'),
  t('Product Line News'),
  t('more'),
  t('Apply'),
  t('Reset'),
  t('Sort by'),
  t('Asc'),
  t('Desc'),
  t('Items per page'),
  t('- All -'),
  t('Offset'),
  t('Subscribe'),
  t('<a href="http://product.example.com/?q=product-line-news.xml" class="feed-icon" title="Subscribe to Product Line News"><img typeof="foaf:Image" src="http://product.example.com/misc/feed.png" width="16" height="16" alt="Subscribe to Product Line News"></a>
'),
  t('Book'),
  t('author'),
  t('Post date'),
  t('Updated date'),
  t('Body'),
  t('Link'),
  t('Path'),
  t('Title'),
  t('E-mail'),
  t('Page'),
  t('Feed'),
);