diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index 99bda3ec740..2811703c648 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -829,13 +829,12 @@ class crm_lead(crm_case, osv.osv):
     # OpenChatter methods and notifications
     # ----------------------------------------
 
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(crm_lead, self).message_get_subscribers_ids(cr, uid, ids, context=context)
-        # add salesman to the subscribers
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(crm_lead, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.user_id:
-                sub_ids.append(obj.user_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+        return super(crm_lead, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
     
     def case_get_note_msg_prefix(self, cr, uid, lead, context=None):
         if isinstance(lead, (int, long)):
diff --git a/addons/hr_holidays/hr_holidays.py b/addons/hr_holidays/hr_holidays.py
index dd5544789c5..98c71dc731b 100644
--- a/addons/hr_holidays/hr_holidays.py
+++ b/addons/hr_holidays/hr_holidays.py
@@ -371,14 +371,15 @@ class hr_holidays(osv.osv):
                     hr_manager_group = self.pool.get('res.groups').read(cr, uid, [obj_id], ['users'], context=context)[0]
                     result[obj.id] = hr_manager_group['users']
         return result
-    
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(hr_holidays, self).message_get_subscribers_ids(cr, uid, ids, context=context)
-        # add the employee and its manager if specified to the subscribed users
+
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(hr_holidays, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.employee_id.parent_id:
-                sub_ids.append(obj.employee_id.parent_id.user_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+            if obj.employee_id.parent_id and not obj.employee_id.parent_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.employee_id.parent_id.id], context=context)
+        return super(hr_holidays, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
         
     def create_notificate(self, cr, uid, ids, context=None):
         for obj in self.browse(cr, uid, ids, context=context):
diff --git a/addons/hr_recruitment/hr_recruitment.py b/addons/hr_recruitment/hr_recruitment.py
index 1ad2d92e564..507421773ac 100644
--- a/addons/hr_recruitment/hr_recruitment.py
+++ b/addons/hr_recruitment/hr_recruitment.py
@@ -483,13 +483,13 @@ class hr_applicant(crm.crm_case, osv.osv):
     # -------------------------------------------------------
     # OpenChatter methods and notifications
     # -------------------------------------------------------
-    
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(hr_applicant, self).message_get_subscribers_ids(cr, uid, ids, context=context)
+
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(hr_applicant, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.user_id:
-                sub_ids.append(obj.user_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+        return super(hr_applicant, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
 
     def get_needaction_user_ids(self, cr, uid, ids, context=None):
         result = dict.fromkeys(ids, [])
diff --git a/addons/mrp/mrp.py b/addons/mrp/mrp.py
index f5192aa8428..aaa11a21fc5 100644
--- a/addons/mrp/mrp.py
+++ b/addons/mrp/mrp.py
@@ -1041,12 +1041,12 @@ class mrp_production(osv.osv):
                 result[obj.id] = [obj.user_id.id]
         return result
 
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(mrp_production, self).message_get_subscribers_ids(cr, uid, ids, context=context)
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(mrp_production, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.user_id:
-                sub_ids.append(obj.user_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+        return super(mrp_production, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
 
     def create_send_note(self, cr, uid, ids, context=None):
         self.message_append_note(cr, uid, ids, body=_("Manufacturing order has been <b>created</b>."), context=context)
diff --git a/addons/project/project.py b/addons/project/project.py
index c4313308106..78832276276 100644
--- a/addons/project/project.py
+++ b/addons/project/project.py
@@ -471,12 +471,12 @@ def Project():
                 result[obj.id] = [obj.user_id.id]
         return result
 
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(project, self).message_get_subscribers_ids(cr, uid, ids, context=context);
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(project, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.user_id:
-                sub_ids.append(obj.user_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+        return super(project, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
 
     def create(self, cr, uid, vals, context=None):
         obj_id = super(project, self).create(cr, uid, vals, context=context)
@@ -1154,14 +1154,14 @@ class task(osv.osv):
                 result[obj.id] = [obj.user_id.id]
         return result
 
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(task, self).message_get_subscribers_ids(cr, uid, ids, context=context)
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(task, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.user_id:
-                sub_ids.append(obj.user_id.id)
-            if obj.manager_id:
-                sub_ids.append(obj.manager_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+            if obj.manager_id and not obj.manager_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.manager_id.id], context=context)
+        return super(task, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
 
     def create_send_note(self, cr, uid, ids, context=None):
         return self.message_append_note(cr, uid, ids, body=_("Task has been <b>created</b>."), context=context)
diff --git a/addons/project_issue/project_issue.py b/addons/project_issue/project_issue.py
index cc8f8b7d091..5492366df7b 100644
--- a/addons/project_issue/project_issue.py
+++ b/addons/project_issue/project_issue.py
@@ -475,19 +475,19 @@ class project_issue(crm.crm_case, osv.osv):
             if obj.state == 'draft' and obj.user_id:
                 result[obj.id] = [obj.user_id.id]
         return result
-    
-    def message_get_subscribers_ids(self, cr, uid, ids, context=None):
-        sub_ids = super(project_issue, self).message_get_subscribers_ids(cr, uid, ids, context=context)
+
+    def message_get_subscribers(self, cr, uid, ids, get_ids=False, context=None):
+        user_ids = super(project_issue, self).message_get_subscribers(cr, uid, ids, True, context=context)
         for obj in self.browse(cr, uid, ids, context=context):
-            if obj.user_id:
-                sub_ids.append(obj.user_id.id)
-        return sub_ids
+            if obj.user_id and not obj.user_id.id in user_ids:
+                self.message_subscribe(cr, uid, [obj.id], [obj.user_id.id], context=context)
+        return super(project_issue, self).message_get_subscribers(cr, uid, ids, get_ids, context=context)
     
     def case_get_note_msg_prefix(self, cr, uid, id, context=None):
         return 'Project issue '
 
     def convert_to_task_send_note(self, cr, uid, ids, context=None):
-        message = _("Project issue has been <b>converted</b> in to task.")
+        message = _("Project issue has been <b>converted</b> into task.")
         return self.message_append_note(cr, uid, ids, body=message, context=context)
 
     def create_send_note(self, cr, uid, ids, context=None):