diff --git a/mailnews/base/public/MANIFEST b/mailnews/base/public/MANIFEST
index ee023fddc69d..bcd124ed28d0 100644
--- a/mailnews/base/public/MANIFEST
+++ b/mailnews/base/public/MANIFEST
@@ -36,3 +36,4 @@ nsIFolderListener.h
 nsIMsgMailSession.h
 nsIMsgIdentity.h
 nsIDOMMsgAppCore.h
+nsICopyMessageListener.h
diff --git a/mailnews/base/public/Makefile.in b/mailnews/base/public/Makefile.in
index 7017e891caf1..999267453aa9 100644
--- a/mailnews/base/public/Makefile.in
+++ b/mailnews/base/public/Makefile.in
@@ -51,6 +51,7 @@ EXPORTS =				\
 		nsIFolderListener.h	\
 		nsIDOMMsgAppCore.h	\
 		nsIMsgGroupRecord.h	\
+		nsICopyMessageListener.h \
 		$(NULL)
 
 include $(topsrcdir)/config/config.mk
diff --git a/mailnews/base/public/makefile.win b/mailnews/base/public/makefile.win
index 08d655c8438e..f08e77a94a38 100644
--- a/mailnews/base/public/makefile.win
+++ b/mailnews/base/public/makefile.win
@@ -25,6 +25,7 @@ IDLSRCS =                                       \
 			nsIFolder.idl						\
 			nsIFolderListener.idl				\
 			nsIMsgGroupRecord.idl				\
+			nsICopyMessageListener.idl			\
 			$(NULL)
 
 EXPORTS =                           \
@@ -48,6 +49,7 @@ EXPORTS =                           \
 			nsIMsgIdentity.h		\
 			nsIDOMMsgAppCore.h		\
 			nsIMsgGroupRecord.h		\
+			nsICopyMessageListener.h \
 			$(NULL)
 
 MODULE=mailnews
diff --git a/mailnews/base/public/nsICopyMessageListener.h b/mailnews/base/public/nsICopyMessageListener.h
new file mode 100644
index 000000000000..e6df0e558d03
--- /dev/null
+++ b/mailnews/base/public/nsICopyMessageListener.h
@@ -0,0 +1,45 @@
+/*
+ * DO NOT EDIT.  THIS FILE IS GENERATED FROM nsICopyMessageListener.idl
+ */
+
+#ifndef __gen_nsICopyMessageListener_h__
+#define __gen_nsICopyMessageListener_h__
+
+#include "nsISupports.h" /* interface nsISupports */
+#include "nsIInputStream.h" /* interface nsIInputStream */
+
+#ifdef XPIDL_JS_STUBS
+#include "jsapi.h"
+#endif
+
+/* starting interface nsICopyMessageListener */
+
+/* {53CA78FE-E231-11d2-8A4D-0060B0FC04D2} */
+#define NS_ICOPYMESSAGELISTENER_IID_STR "53CA78FE-E231-11d2-8A4D-0060B0FC04D2"
+#define NS_ICOPYMESSAGELISTENER_IID \
+  {0x53CA78FE, 0xE231, 0x11d2, \
+    { 0x8A, 0x4D, 0x00, 0x60, 0xB0, 0xFC, 0x04, 0xD2 }}
+
+class nsICopyMessageListener : public nsISupports {
+ public: 
+  static const nsIID& GetIID() {
+    static nsIID iid = NS_ICOPYMESSAGELISTENER_IID;
+    return iid;
+  }
+
+  /* void BeginCopy (); */
+  NS_IMETHOD BeginCopy() = 0;
+
+  /* void CopyData (in nsIInputStream aIStream, in long aLength); */
+  NS_IMETHOD CopyData(nsIInputStream *aIStream, PRInt32 aLength) = 0;
+
+  /* void EndCopy (); */
+  NS_IMETHOD EndCopy() = 0;
+
+#ifdef XPIDL_JS_STUBS
+  static NS_EXPORT_(JSObject *) InitJSClass(JSContext *cx);
+  static NS_EXPORT_(JSObject *) GetJSObject(JSContext *cx, nsICopyMessageListener *priv);
+#endif
+};
+
+#endif /* __gen_nsICopyMessageListener_h__ */
diff --git a/mailnews/base/public/nsICopyMessageListener.idl b/mailnews/base/public/nsICopyMessageListener.idl
new file mode 100644
index 000000000000..f0609d68b386
--- /dev/null
+++ b/mailnews/base/public/nsICopyMessageListener.idl
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ *
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1999 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#include "nsISupports.idl"
+#include "nsIInputStream.idl"
+
+
+[uuid(53CA78FE-E231-11d2-8A4D-0060B0FC04D2)]
+
+/*  Use this for any object that wants to handle copying/moving messages to it */
+
+interface nsICopyMessageListener :  nsISupports
+{
+	void BeginCopy();
+	void CopyData(in nsIInputStream aIStream, in long aLength);
+	void EndCopy();
+};
diff --git a/mailnews/base/public/nsIDOMMsgAppCore.h b/mailnews/base/public/nsIDOMMsgAppCore.h
index 01e6d68fe5bc..d8a27fd6bdd4 100644
--- a/mailnews/base/public/nsIDOMMsgAppCore.h
+++ b/mailnews/base/public/nsIDOMMsgAppCore.h
@@ -7,7 +7,7 @@
 
 #include "nsISupports.h" /* interface nsISupports */
 #include "nsIDOMWindow.h" /* interface nsIDOMWindow */
-#include "nsID.h" /* interface nsID */
+#include "nsIDOMXULElement.h" /* interface nsIDOMXULElement */
 #include "nsIDOMXULTreeElement.h" /* interface nsIDOMXULTreeElement */
 #include "nsIDOMBaseAppCore.h" /* interface nsIDOMBaseAppCore */
 #include "nsIDOMNodeList.h" /* interface nsIDOMNodeList */
@@ -43,8 +43,11 @@ class nsIDOMMsgAppCore : public nsIDOMBaseAppCore {
   /* void OpenURL (in string str); */
   NS_IMETHOD OpenURL(const char *str) = 0;
 
-  /* void DeleteMessage (in nsIDOMXULTreeElement tree, in nsIDOMNodeList node); */
-  NS_IMETHOD DeleteMessage(nsIDOMXULTreeElement *tree, nsIDOMNodeList *node) = 0;
+  /* void DeleteMessage (in nsIDOMXULTreeElement tree, in nsIDOMXULElement srcFolder, in nsIDOMNodeList node); */
+  NS_IMETHOD DeleteMessage(nsIDOMXULTreeElement *tree, nsIDOMXULElement *srcFolder, nsIDOMNodeList *node) = 0;
+
+  /* void CopyMessages (in nsIDOMXULElement srcFolderElement, in nsIDOMXULElement dstFolderElement, in nsIDOMNodeList messages, in boolean isMove); */
+  NS_IMETHOD CopyMessages(nsIDOMXULElement *srcFolderElement, nsIDOMXULElement *dstFolderElement, nsIDOMNodeList *messages, PRBool isMove) = 0;
 
   /* nsISupports GetRDFResourceForMessage (in nsIDOMXULTreeElement tree, in nsIDOMNodeList node); */
   NS_IMETHOD GetRDFResourceForMessage(nsIDOMXULTreeElement *tree, nsIDOMNodeList *node, nsISupports **_retval) = 0;
diff --git a/mailnews/base/public/nsIDOMMsgAppCore.idl b/mailnews/base/public/nsIDOMMsgAppCore.idl
index 2a56e220d9b2..a90902792eb2 100644
--- a/mailnews/base/public/nsIDOMMsgAppCore.idl
+++ b/mailnews/base/public/nsIDOMMsgAppCore.idl
@@ -41,6 +41,7 @@
 #include "nsIDOMWindow.idl"
 #include "nsIDOMNodeList.idl"
 #include "nsIDOMXULTreeElement.idl"
+#include "nsIDOMXULElement.idl"
 
 [object, uuid(4f7966d0-c14f-11d2-b7f2-00805f05ffa5)]
 interface nsIDOMMsgAppCore : nsIDOMBaseAppCore {
@@ -49,7 +50,9 @@ interface nsIDOMMsgAppCore : nsIDOMBaseAppCore {
 	void Open3PaneWindow();
     void SetWindow(in nsIDOMWindow ptr);
     void OpenURL(in string str);
-    void DeleteMessage(in nsIDOMXULTreeElement tree, in nsIDOMNodeList node);
+    void DeleteMessage(in nsIDOMXULTreeElement tree, in nsIDOMXULElement srcFolder, in nsIDOMNodeList node);
+	void CopyMessages(in nsIDOMXULElement srcFolderElement, in nsIDOMXULElement dstFolderElement, in nsIDOMNodeList messages,
+					  in boolean isMove);
     nsISupports GetRDFResourceForMessage(in nsIDOMXULTreeElement tree, in nsIDOMNodeList node);
 	void Exit();
 };