Index: /trunk/doc/manual/en_US/user_Security.xml
===================================================================
--- /trunk/doc/manual/en_US/user_Security.xml	(revision 53022)
+++ /trunk/doc/manual/en_US/user_Security.xml	(revision 53023)
@@ -353,4 +353,11 @@
           SSH). The security properties are similar to bridged Ethernet.</para>
         </listitem>
+
+        <listitem>
+          <para>Because of shortcomings in older Windows versions, using
+          VirtualBox on Windows versions older than Vista with Service Pack 1
+          is not recommended.</para>
+        </listitem>
+
       </itemizedlist></para>
     </sect2>