Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5923)
+++ /CKEditor/trunk/CHANGES.html	(revision 5924)
@@ -55,9 +55,10 @@
 		<li><a href="http://dev.ckeditor.com/ticket/6353">#6353</a> : [IE] Resize was broken with office2003 and v2 skins.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/6375">#6375</a> : Avoiding errors when hiding the editor after the blur event.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/6133">#6133</a> : Styled paragraphs result on buggy list creation.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/5074">#5074</a> : Link target is not removed when changing to popup.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/6408">#6408</a> : [IE] Autogrow now works correctly on Quirks.</li>
 		<li>Updated the following language files:<ul>
 			<li><a href="http://dev.ckeditor.com/ticket/6427">#6427</a> : Ukrainian;</li>
 		</ul></li>
-		<li><a href="http://dev.ckeditor.com/ticket/6133">#6133</a> : Styled paragraphs result on buggy list creation.</li>
-		<li><a href="http://dev.ckeditor.com/ticket/5074">#5074</a> : Link target is not removed when changing to popup.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/autogrow/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/autogrow/plugin.js	(revision 5923)
+++ /CKEditor/trunk/_source/plugins/autogrow/plugin.js	(revision 5924)
@@ -15,6 +15,7 @@
 
 		// We can not use documentElement to calculate the height for IE (#6061).
+		// It is not good for Quirks, yet using offsetHeight would also not work as expected (#6408).
 		if ( CKEDITOR.env.ie )
-			newHeight = doc.getBody().$.scrollHeight + 24;
+			newHeight = doc.getBody().$.scrollHeight + ( CKEDITOR.env.quirks ? 0 : 24 );
 		else
 			newHeight = doc.getDocumentElement().$.offsetHeight;