diff --git a/addons/event/event.py b/addons/event/event.py
index feebd3a3f93..1bd52f2389b 100644
--- a/addons/event/event.py
+++ b/addons/event/event.py
@@ -293,17 +293,17 @@ class event_event(osv.osv):
 
     def create_send_note(self, cr, uid, ids, context=None):
         message = _("Event has been <b>created</b>.")
-        self.message_post(cr, uid, ids, body=message, subtype_xml_id="event_subtype_new", context=context)
+        self.message_post(cr, uid, ids, body=message, subtype_xml_id="mt_event_new", context=context)
         return True
 
     def button_cancel_send_note(self, cr, uid, ids, context=None):
         message = _("Event has been <b>cancelled</b>.")
-        self.message_post(cr, uid, ids, body=message, subtype_xml_id="event_subtype_cancelled", context=context)
+        self.message_post(cr, uid, ids, body=message, subtype_xml_id="mt_event_cancel", context=context)
         return True
 
     def button_draft_send_note(self, cr, uid, ids, context=None):
         message = _("Event has been set to <b>draft</b>.")
-        self.message_post(cr, uid, ids, body=message, subtype_xml_id="event_subtype_new", context=context)
+        self.message_post(cr, uid, ids, body=message, subtype_xml_id="mt_event_new", context=context)
         return True
 
     def button_done_send_note(self, cr, uid, ids, context=None):
@@ -313,7 +313,7 @@ class event_event(osv.osv):
 
     def button_confirm_send_note(self, cr, uid, ids, context=None):
         message = _("Event has been <b>confirmed</b>.")
-        self.message_post(cr, uid, ids, body=message, subtype_xml_id="event_subtype_confirmed", context=context)
+        self.message_post(cr, uid, ids, body=message, subtype_xml_id="mt_event_confirm", context=context)
         return True
 
 event_event()
@@ -359,7 +359,7 @@ class event_registration(osv.osv):
         return self.write(cr, uid, ids, {'state': 'draft'}, context=context)
 
     def confirm_registration(self, cr, uid, ids, context=None):
-        self.message_post(cr, uid, ids, body=_('State set to open'),subtype_xml_id="registration_subtype_confirmed", context=context)
+        self.message_post(cr, uid, ids, body=_('State set to open'),subtype_xml_id="mt_registration_confirm", context=context)
         return self.write(cr, uid, ids, {'state': 'open'},context=context)
 
     def create(self, cr, uid, vals, context=None):
@@ -389,13 +389,13 @@ class event_registration(osv.osv):
             if today >= registration.event_id.date_begin:
                 values = {'state': 'done', 'date_closed': today}
                 self.write(cr, uid, ids, values)
-                self.message_post(cr, uid, ids, body=_('State set to Done'), subtype_xml_id="registration_subtype_closed", context=context)
+                self.message_post(cr, uid, ids, body=_('State set to Done'), context=context)
             else:
-                raise osv.except_osv(_('Error!'),_("You must wait for the starting day of the event to do this action.") )
+                raise osv.except_osv(_('Error!'), _("You must wait for the starting day of the event to do this action."))
         return True
 
     def button_reg_cancel(self, cr, uid, ids, context=None, *args):
-        self.message_post(cr, uid, ids, body=_('State set to Cancel'), subtype_xml_id="registration_subtype_cancelled", context=context)
+        self.message_post(cr, uid, ids, body=_('State set to Cancel'), subtype_xml_id="mt_registration_cancel", context=context)
         return self.write(cr, uid, ids, {'state': 'cancel'})
 
     def mail_user(self, cr, uid, ids, context=None):
@@ -465,12 +465,12 @@ class event_registration(osv.osv):
 
     def create_send_note(self, cr, uid, ids, context=None):
         message = _("Registration has been <b>created</b>.")
-        self.message_post(cr, uid, ids, body=message, subtype_xml_id="registration_subtype_new", context=context)
+        self.message_post(cr, uid, ids, body=message, context=context)
         return True
 
     def do_draft_send_note(self, cr, uid, ids, context=None):
         message = _("Registration has been set as <b>draft</b>.")
-        self.message_post(cr, uid, ids, body=message, subtype_xml_id="registration_subtype_new", context=context)
+        self.message_post(cr, uid, ids, body=message, context=context)
         return True
 
 event_registration()
diff --git a/addons/event/event_data.xml b/addons/event/event_data.xml
index 251f78973c7..9fa16b77689 100644
--- a/addons/event/event_data.xml
+++ b/addons/event/event_data.xml
@@ -11,43 +11,31 @@
             <field name="action_id" ref="action_client_event_menu"/>
             <field name="state">open</field>
         </record>
-        <!-- Event subtype -->
-        <record id="mail.event_subtype_new" model="mail.message.subtype">
-            <field name="name">new</field>
+
+        <!-- mail: event subtype -->
+        <record id="mail.mt_event_new" model="mail.message.subtype">
+            <field name="name">created</field>
             <field name="res_model">event.event</field>
             <field name="default" eval="False"/>
         </record>
-        <record id="mail.event_subtype_closed" model="mail.message.subtype">
-            <field name="name">closed</field>
-            <field name="res_model">event.event</field>
-        </record>
-        <record id="mail.event_subtype_cancelled" model="mail.message.subtype">
-            <field name="name">cancelled</field>
+        <record id="mail.mt_event_cancel" model="mail.message.subtype">
+            <field name="name">canceled</field>
             <field name="res_model">event.event</field>
             <field name="default" eval="False"/>
         </record>
-        <record id="mail.event_subtype_confirmed" model="mail.message.subtype">
+        <record id="mail.mt_event_confirm" model="mail.message.subtype">
             <field name="name">confirmed</field>
             <field name="res_model">event.event</field>
             <field name="default" eval="False"/>
         </record>
         
-        <!-- Event registration subtype -->
-        <record id="mail.registration_subtype_new" model="mail.message.subtype">
-            <field name="name">new</field>
-            <field name="res_model">event.registration</field>
-            <field name="default" eval="False"/>
-        </record>
-        <record id="mail.registration_subtype_closed" model="mail.message.subtype">
-            <field name="name">closed</field>
-            <field name="res_model">event.registration</field>
-        </record>
-        <record id="mail.registration_subtype_cancelled" model="mail.message.subtype">
-            <field name="name">cancelled</field>
+        <!-- mail: event registration subtype -->
+        <record id="mail.mt_registration_cancel" model="mail.message.subtype">
+            <field name="name">canceled</field>
             <field name="res_model">event.event</field>
             <field name="default" eval="False"/>
         </record>
-        <record id="mail.registration_subtype_confirmed" model="mail.message.subtype">
+        <record id="mail.mt_registration_confirm" model="mail.message.subtype">
             <field name="name">confirmed</field>
             <field name="res_model">event.registration</field>
             <field name="default" eval="False"/>