Index: wp-content/themes/twentytwelve/css/ie.css
===================================================================
--- wp-content/themes/twentytwelve/css/ie.css	(revision 0)
+++ wp-content/themes/twentytwelve/css/ie.css	(working copy)
@@ -0,0 +1,189 @@
+body {
+	background-color: #e6e6e6;
+}
+body .site {
+	padding: 0 40px;
+	margin-top: 48px;
+	margin-bottom: 48px;
+	box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
+}
+body.custom-background-empty {
+	background-color: #fff;
+}
+body.custom-background-empty .site,
+body.custom-background-white .site {
+	padding: 0;
+	margin-top: 0;
+	margin-bottom: 0;
+	box-shadow: none;
+}
+.skip-link,
+.screen-reader-text,
+.assistive-text {
+	clip: rect(1px 1px 1px 1px); /* IE7 */
+}
+.full-width .site-content {
+	float: none;
+	width: 100%;
+}
+img.size-full,
+img.size-large,
+img.header-image,
+img.wp-post-image {
+	width: auto; /* Prevent stretching of full-size and large-size images with height and width attributes in IE8 */
+}
+.author-avatar {
+	float: left;
+	margin-top: 8px;
+	margin-top: 0.571428571rem;
+}
+.author-description {
+	float: right;
+	width: 80%;
+}
+.site {
+	margin: 48px auto;
+	max-width: 960px;
+
+	overflow: hidden;
+}
+.site-content {
+	float: left;
+	width: 65.104166667%;
+}
+body.template-front-page .site-content,
+body.single-attachment .site-content,
+body.full-width .site-content {
+	width: 100%;
+}
+.widget-area {
+	float: right;
+	width: 26.041666667%;
+}
+.site-header h1,
+.site-header h2 {
+	text-align: left;
+}
+.site-header h1 {
+	font-size: 26px;
+	line-height: 1.846153846;
+}
+.main-navigation ul.nav-menu,
+.main-navigation div.nav-menu > ul {
+	border-bottom: 1px solid #ededed;
+	border-top: 1px solid #ededed;
+	display: inline-block !important;
+	text-align: left;
+	width: 100%;
+}
+.main-navigation ul {
+	margin: 0;
+	text-indent: 0;
+}
+.main-navigation li a,
+.main-navigation li {
+	display: inline-block;
+	text-decoration: none;
+}
+.ie7 .main-navigation li a,
+.ie7 .main-navigation li {
+	display: inline;
+}
+.main-navigation li a {
+	border-bottom: 0;
+	color: #6a6a6a;
+	line-height: 3.692307692;
+	text-transform: uppercase;
+}
+.main-navigation li a:hover {
+	color: #000;
+}
+.main-navigation li {
+	margin: 0 40px 0 0;
+	position: relative;
+}
+.main-navigation li ul {
+	display: none;
+	margin: 0;
+	padding: 0;
+	position: absolute;
+	top: 100%;
+	z-index: 1;
+}
+.ie7 .main-navigation li ul {
+	left: 0;
+}
+.main-navigation li ul ul,
+.ie7 .main-navigation li ul ul {
+	top: 0;
+	left: 100%;
+}
+.main-navigation ul li:hover > ul {
+	border-left: 0;
+	display: block;
+}
+.main-navigation li ul li a {
+	background: #efefef;
+	border-bottom: 1px solid #ededed;
+	display: block;
+	font-size: 11px;
+	line-height: 2.181818182;
+	padding: 8px 10px;
+	width: 180px;
+}
+.main-navigation li ul li a:hover {
+	background: #e3e3e3;
+	color: #444;
+}
+.main-navigation .current-menu-item > a,
+.main-navigation .current-menu-ancestor > a,
+.main-navigation .current_page_item > a,
+.main-navigation .current_page_ancestor > a {
+	color: #636363;
+	font-weight: bold;
+}
+.menu-toggle {
+	display: none;
+}
+.entry-header .entry-title {
+	font-size: 22px;
+}
+#respond form input[type="text"] {
+	width: 46.333333333%;
+}
+#respond form textarea.blog-textarea {
+	width: 79.666666667%;
+}
+.template-front-page .site-content,
+.template-front-page article {
+	overflow: hidden;
+}
+.template-front-page.has-post-thumbnail article {
+	float: left;
+	width: 47.916666667%;
+}
+.entry-page-image {
+	float: right;
+	margin-bottom: 0;
+	width: 47.916666667%;
+}
+.template-front-page .widget-area .widget,
+.template-front-page.two-sidebars .widget-area .front-widgets {
+	float: left;
+	width: 51.875%;
+	margin-bottom: 24px;
+}
+.template-front-page .widget-area .widget:nth-child(odd) {
+	clear: right;
+}
+.template-front-page .widget-area .widget:nth-child(even),
+.template-front-page.two-sidebars .widget-area .front-widgets + .front-widgets {
+	float: right;
+	width: 39.0625%;
+	margin: 0 0 24px;
+}
+.template-front-page.two-sidebars .widget,
+.template-front-page.two-sidebars .widget:nth-child(even) {
+	float: none;
+	width: auto;
+}
\ No newline at end of file
Index: wp-content/themes/twentytwelve/functions.php
===================================================================
--- wp-content/themes/twentytwelve/functions.php	(revision 22119)
+++ wp-content/themes/twentytwelve/functions.php	(working copy)
@@ -88,6 +88,8 @@
  * @since Twenty Twelve 1.0
  */
 function twentytwelve_scripts_styles() {
+	global $wp_styles;
+
 	/*
 	 * Adds JavaScript to pages with the comment form to support
 	 * sites with threaded comments (when in use).
@@ -141,6 +143,12 @@
 	 * Loads our main stylesheet.
 	 */
 	wp_enqueue_style( 'twentytwelve-style', get_stylesheet_uri() );
+
+	/*
+	 * Loads the Internet Explorer specific stylesheet.
+	 */
+	wp_enqueue_style( 'twentytwelve-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentytwelve-style' ), '20121002' );
+	$wp_styles->add_data( 'twentytwelve-ie', 'conditional', 'lt IE 9' );
 }
 add_action( 'wp_enqueue_scripts', 'twentytwelve_scripts_styles' );
 
Index: wp-content/themes/twentytwelve/header.php
===================================================================
--- wp-content/themes/twentytwelve/header.php	(revision 22119)
+++ wp-content/themes/twentytwelve/header.php	(working copy)
@@ -9,9 +9,12 @@
  * @since Twenty Twelve 1.0
  */
 ?><!DOCTYPE html>
-<!--[if IE 7 | IE 8]>
-<html class="ie" <?php language_attributes(); ?>>
+<!--[if IE 7]>
+<html class="ie ie7" <?php language_attributes(); ?>>
 <![endif]-->
+<!--[if IE 8]>
+<html class="ie ie8" <?php language_attributes(); ?>>
+<![endif]-->
 <!--[if !(IE 7) | !(IE 8)  ]><!-->
 <html <?php language_attributes(); ?>>
 <!--<![endif]-->
