--- a/libpurple/protocols/msn/contact.h
+++ b/libpurple/protocols/msn/contact.h
@@ -60,7 +60,7 @@ typedef enum
 #include "session.h"
 #include "soap.h"
 
-#define MSN_APPLICATION_ID "CFE80F9D-180F-4399-82AB-413F33A1FA11"
+#define MSN_APPLICATION_ID "AAD9B99B-58E6-4F23-B975-D9EC1F9EC24A"
 
 #define MSN_CONTACT_SERVER	"local-bay.contacts.msn.com"