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diff --git a/shell/Evolution-Offline.idl b/shell/Evolution-Offline.idl
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+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * Interface to allow components to switch between on-line and off-line mode.
+ *
+ * Authors:
+ *   Ettore Perazzoli <ettore@ximian.com>
+ *
+ * Copyright (C) 2001 Ximian, Inc.
+ */
+
+#include <Bonobo.h>
+
+module GNOME {
+module Evolution {
+
+struct Connection {
+	string hostName;
+	short portNumber;
+};
+typedef sequence<Connection> ConnectionList;
+
+interface OfflineProgressListener : Bonobo::Unknown {
+	/* Update the shell about the progress of going off-line.  The
+	   operation is considered completed when the ConnectionList is empty. */
+	void updateProgress (in ConnectionList current_active_connections);
+};
+
+interface Offline : Bonobo::Unknown {
+	/* Whether the component is currently off-line.  */
+	attribute boolean isOffline;
+
+	/* Ask the component to prepare to go into off-line mode.  The
+	   component must return a list of the current active connections.
+	   After this call, the shell is expected to either invoke
+	   `::goOffline()' (actually complete the operation and go off-line) or
+	   `::goOnline()' (operation cancelled).   */
+	void prepareForOffline (out ConnectionList active_connection_list);
+
+	/* Ask the component to go into off-line mode.  This always comes after
+	   a `::prepareForOffline' only. */
+	void goOffline (in OfflineProgressListener listener);
+
+	/* Tell the component to go into on-line mode.  */
+	void goOnline ();
+};
+
+};
+};