diff -r b5fbb9b25d57 -r 67369d1b217f email_plat/email_client_api/inc/memailmailbox.h
--- a/email_plat/email_client_api/inc/memailmailbox.h	Tue May 11 15:57:15 2010 +0300
+++ b/email_plat/email_client_api/inc/memailmailbox.h	Tue May 25 12:23:16 2010 +0300
@@ -140,6 +140,17 @@
      * The method follows "fire and forget" pattern, returns immediately.
      */
     virtual void EditNewMessageL() = 0;
+    
+    /** Register mailbox observer 
+     * @param aObserver observer called back when changes in mailbox (new message,
+     * messages changes or messages deleted).
+     * */
+    virtual void RegisterObserverL( MMailboxContentObserver& aObserver ) = 0;
+        
+    /** 
+     * Unregister mailbox observe.r 
+     */
+    virtual void UnregisterObserver( MMailboxContentObserver& aObserver ) = 0;
 
 };