diff --git a/addons/mail/mail_thread.py b/addons/mail/mail_thread.py
index ac2b0efb670..63043f992f3 100644
--- a/addons/mail/mail_thread.py
+++ b/addons/mail/mail_thread.py
@@ -799,7 +799,7 @@ class mail_thread(osv.AbstractModel):
         # if subtypes are not specified (and not set to a void list), fetch default ones
         if subtype_ids is None:
             subtype_obj = self.pool.get('mail.message.subtype')
-            subtype_ids = subtype_obj.search(cr, SUPERUSER_ID, [('default', '=', True), '|', ('res_model', '=', self._name), ('res_model', '=', False)], context=context)
+            subtype_ids = subtype_obj.search(cr, uid, [('default', '=', True), '|', ('res_model', '=', self._name), ('res_model', '=', False)], context=context)
         # update the subscriptions
         fol_obj = self.pool.get('mail.followers')
         fol_ids = fol_obj.search(cr, SUPERUSER_ID, [('res_model', '=', self._name), ('res_id', 'in', ids), ('partner_id', 'in', partner_ids)], context=context)
diff --git a/addons/mail/res_users.py b/addons/mail/res_users.py
index 6f1329597c6..33a6b56342c 100644
--- a/addons/mail/res_users.py
+++ b/addons/mail/res_users.py
@@ -127,7 +127,7 @@ class res_users(osv.Model):
             context['thread_model'] = 'res.partner'
         if isinstance(thread_id, (list, tuple)):
             thread_id = thread_id[0]
-        partner_id = self.pool.get('res.users').read(cr, uid, thread_id, ['partner_id'], context=context)['partner_id'][0]
+        partner_id = self.browse(cr, uid, thread_id).partner_id.id
         return self.pool.get('res.partner').message_post_user_api(cr, uid, partner_id, body=body, subject=subject,
             parent_id=parent_id, attachment_ids=attachment_ids, context=context, content_subtype=content_subtype, **kwargs)
 
@@ -141,11 +141,11 @@ class res_users(osv.Model):
             context['thread_model'] = 'res.partner'
         if isinstance(thread_id, (list, tuple)):
             thread_id = thread_id[0]
-        partner_id = self.pool.get('res.users').read(cr, uid, thread_id, ['partner_id'], context=context)['partner_id'][0]
+        partner_id = self.browse(cr, uid, thread_id).partner_id.id
         return self.pool.get('res.partner').message_post(cr, uid, partner_id, context=context, **kwargs)
 
     def message_update(self, cr, uid, ids, msg_dict, update_vals=None, context=None):
-        partner_id = self.pool.get('res.users').browse(cr, uid, ids)[0].partner_id.id
+        partner_id = self.browse(cr, uid, ids)[0].partner_id.id
         return self.pool.get('res.partner').message_update(cr, uid, [partner_id], msg_dict,
             update_vals=update_vals, context=context)