diff --git a/reference/imap/configure.xml b/reference/imap/configure.xml
index 2246efdb4f..5c2b29e156 100644
--- a/reference/imap/configure.xml
+++ b/reference/imap/configure.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.6 $ -->
+<!-- $Revision: 1.7 $ -->
 <section id="imap.installation">
  &reftitle.install;
  <para>
@@ -9,7 +9,10 @@
   <option role="configure">--with-imap=/usr/local/imap-2000b</option>.
   This location depends on where you created this directory according to the
   description above.  Windows users may include the 
-  <filename>php_imap.dll</filename> DLL in &php.ini;
+  <filename>php_imap.dll</filename> DLL in &php.ini;.
+  IMAP is not supported on systems earlier that Windows 2000. This is because it
+  uses encryption functions in order to enable SSL connections to the mail
+  servers.
  </para>
  <note>
   <simpara>