Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5964)
+++ /CKEditor/trunk/CHANGES.html	(revision 5965)
@@ -77,4 +77,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/6253">#6253</a> : BIDI: creating a Numbered/Bulleted list causing improper behavior on bidi.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/4023">#4023</a> : [Opera] Maximize plugin.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/6416">#6416</a> : [IE9] Unable to make text selection with mouse in source area.</li>
 		<li>Updated the following language files:<ul>
 			<li><a href="http://dev.ckeditor.com/ticket/6427">#6427</a> : Ukrainian;</li>
Index: /CKEditor/trunk/_source/plugins/sourcearea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/sourcearea/plugin.js	(revision 5964)
+++ /CKEditor/trunk/_source/plugins/sourcearea/plugin.js	(revision 5965)
@@ -1,3 +1,3 @@
-/*
+/*
 Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.html or http://ckeditor.com/license
@@ -73,10 +73,10 @@
 								setTimeout( onResize, 0 );
 							}
-							else
-							{
-								// By some yet unknown reason, we must stop the
-								// mousedown propagation for the textarea,
-								// otherwise it's not possible to place the caret
-								// inside of it (non IE).
+							// As we prevent click to put focus on editor container,
+							// while 'mousedown' inside <textarea> is also captured,
+							// but we must stop the even propagation, otherwise
+							// it's not possible to place the caret inside of it (non IE and IE9).
+							if ( document.addEventListener )
+							{
 								textarea.on( 'mousedown', function( evt )
 									{