diff --git a/mailnews/base/resources/content/contents.rdf b/mailnews/base/resources/content/contents.rdf
index 5501a1b52fb..5194e9a90ca 100644
--- a/mailnews/base/resources/content/contents.rdf
+++ b/mailnews/base/resources/content/contents.rdf
@@ -1,3 +1,8 @@
+<!-- If you modify this file, please also update the following files -->
+<!-- mailnews/mapi/resources/content/contents.rdf in mozilla tree -->
+<!-- mailnews/base/resources/content/contents.rdf and -->
+<!-- mailnews/mapi/resources/content/contents.rdf in the ns tree -->
+
 <?xml version="1.0"?>
 <RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
          xmlns:chrome="http://www.mozilla.org/rdf/chrome#">
diff --git a/mailnews/mapi/resources/content/contents.rdf b/mailnews/mapi/resources/content/contents.rdf
index ef4cfe32ea3..bc2fb1576ef 100644
--- a/mailnews/mapi/resources/content/contents.rdf
+++ b/mailnews/mapi/resources/content/contents.rdf
@@ -1,3 +1,6 @@
+<!-- If you modify this file, please also update the following files -->
+<!-- mailnews/mapi/resources/content/contents.rdf in the ns tree -->
+
 <?xml version="1.0"?>
 <RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
          xmlns:chrome="http://www.mozilla.org/rdf/chrome#">
diff --git a/mailnews/mapi/resources/content/overlays.rdf b/mailnews/mapi/resources/content/overlays.rdf
index c86ba3b3ca0..e69de29bb2d 100644
--- a/mailnews/mapi/resources/content/overlays.rdf
+++ b/mailnews/mapi/resources/content/overlays.rdf
@@ -1,24 +0,0 @@
-<?xml version="1.0"?>
-<RDF:RDF xmlns:chrome="http://www.mozilla.org/rdf/chrome#"
-         xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
-
-   <!-- mapi items for mailnews preferences -->
-   <RDF:Seq about="urn:mozilla:overlays">
-    <RDF:li resource="chrome://messenger/content/pref-mailnews.xul"/>
-    <RDF:li resource="chrome://messenger/content/messenger.xul"/>
-    <RDF:li resource="chrome://messenger/content/mail3PaneWindowVertLayout.xul"/>
-   </RDF:Seq>
-
-   <RDF:Seq about="chrome://messenger/content/pref-mailnews.xul">
-     <RDF:li>chrome://messenger/content/pref-mailnewsOverlay.xul</RDF:li>
-   </RDF:Seq>
-
-   <RDF:Seq about="chrome://messenger/content/messenger.xul">
-     <RDF:li>chrome://messenger/content/mailIntegrationOverlay.xul</RDF:li>
-   </RDF:Seq>
-   
-   <RDF:Seq about="chrome://messenger/content/mail3PaneWindowVertLayout.xul">
-     <RDF:li>chrome://messenger/content/mailIntegrationOverlay.xul</RDF:li>
-   </RDF:Seq>
-
-</RDF:RDF>