diff --git a/addons/base_calendar/base_calendar.py b/addons/base_calendar/base_calendar.py
index d225c3f90d9..4c4e7a16876 100644
--- a/addons/base_calendar/base_calendar.py
+++ b/addons/base_calendar/base_calendar.py
@@ -384,9 +384,26 @@ property or property parameter."),
         'cutype': 'individual',
     }
 
+
     def copy(self, cr, uid, id, default=None, context=None):
         raise osv.except_osv(_('Warning!'), _('You cannot duplicate a calendar attendee.'))
-
+    
+    def onchange_partner_id(self, cr, uid, ids, partner_id,context=None):
+        """
+        Make entry on email and availbility on change of partner_id field.
+        @param cr: the current row, from the database cursor
+        @param uid: the current user's ID for security checks
+        @param ids: list of calendar attendee's IDs
+        @param partner_id: changed value of partner id
+        @param context: a standard dictionary for contextual values
+        @return: dictionary of values which put value in email and availability fields
+        """
+        
+        if not partner_id:
+            return {'value': {'email': ''}}
+        partner = self.pool.get('res.partner').browse(cr, uid, partner_id, context=context)
+        return {'value': {'email': partner.email}}
+    
     def get_ics_file(self, cr, uid, event_obj, context=None):
         """
         Returns iCalendar file for the event invitation.
diff --git a/addons/base_calendar/crm_meeting_view.xml b/addons/base_calendar/crm_meeting_view.xml
index 84c03d68dbd..77018898c84 100644
--- a/addons/base_calendar/crm_meeting_view.xml
+++ b/addons/base_calendar/crm_meeting_view.xml
@@ -171,10 +171,10 @@
                             </group>
                         </group>
                     </page>
-                    <page string="Invitations" groups="base.group_no_one">
+                    <page string="Invitations">
                         <field name="attendee_ids" widget="one2many" mode="tree">
                             <tree string="Invitation details" editable="top">
-                                <field name="partner_id"/>
+                                <field name="partner_id" on_change="onchange_partner_id(partner_id)"/>
                                 <field name="email" string="Mail To"/>
                                 <field name="state"/>
                                 <button name="do_tentative"