diff --git a/SOPE/NGCards/iCalEventChanges.h b/SOPE/NGCards/iCalEventChanges.h
index 7bb50893f..6b85984b0 100644
--- a/SOPE/NGCards/iCalEventChanges.h
+++ b/SOPE/NGCards/iCalEventChanges.h
@@ -1,24 +1,22 @@
-/*
- Copyright (C) 2004-2005 SKYRIX Software AG
- 
- This file is part of SOPE.
- 
- SOPE is free software; you can redistribute it and/or modify it under
- the terms of the GNU Lesser General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
-
- SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
- License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with SOPE; see the file COPYING.  If not, write to the
- Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
+/* iCalEventChanges.h - this file is part of SOPE
+ *
+ * Copyright (C) 2004-2016 Inverse inc.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
  */
-//  Created by znek on 31.08.04.
 
 #ifndef	__NGiCal_iCalEventChanges_H_
 #define	__NGiCal_iCalEventChanges_H_
@@ -41,6 +39,7 @@
 - (id)initWithFromEvent:(iCalEvent *)_from toEvent:(iCalEvent *)_to;
 
 - (BOOL)hasChanges;
+- (BOOL)hasMajorChanges;
 
 - (BOOL)hasAttendeeChanges;
 - (NSArray *)insertedAttendees;
diff --git a/SOPE/NGCards/iCalEventChanges.m b/SOPE/NGCards/iCalEventChanges.m
index a8c908e77..bc8283c11 100644
--- a/SOPE/NGCards/iCalEventChanges.m
+++ b/SOPE/NGCards/iCalEventChanges.m
@@ -1,22 +1,21 @@
-/*
- Copyright (C) 2004-2005 SKYRIX Software AG
-
- This file is part of SOPE.
-
- SOPE is free software; you can redistribute it and/or modify it under
- the terms of the GNU Lesser General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
-
- SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
- License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with SOPE; see the file COPYING.  If not, write to the
- Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
+/* iCalEventChanges.m - this file is part of SOPE
+ *
+ * Copyright (C) 2004-2016 Inverse inc.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
  */
 
 #import <Foundation/NSArray.h>
@@ -158,6 +157,13 @@
          [self hasPropertyChanges];
 }
 
+- (BOOL)hasMajorChanges {
+  return
+    [self hasAttendeeChanges]  ||
+    ([self hasPropertyChanges] &&
+     ([[self updatedProperties] count] > 1 || ![[self updatedProperties] containsObject: @"lastModified"]));
+}
+
 - (BOOL)hasAttendeeChanges {
   return [[self insertedAttendees] count] > 0 ||
          [[self deletedAttendees]  count] > 0 ||
diff --git a/SoObjects/Appointments/SOGoAppointmentObject.m b/SoObjects/Appointments/SOGoAppointmentObject.m
index 912b5d69b..884876bed 100644
--- a/SoObjects/Appointments/SOGoAppointmentObject.m
+++ b/SoObjects/Appointments/SOGoAppointmentObject.m
@@ -891,7 +891,7 @@ inRecurrenceExceptionsForEvent: (iCalEvent *) theEvent
                                withType: @"calendar:invitation"];
     }
 
-  if ([changes hasChanges])
+  if ([changes hasMajorChanges])
     [self sendReceiptEmailForObject: newEvent
                      addedAttendees: addedAttendees
                    deletedAttendees: deletedAttendees
@@ -2275,11 +2275,13 @@ inRecurrenceExceptionsForEvent: (iCalEvent *) theEvent
         } // if ([[newEvent attendees] count] || [[oldEvent attendees] count])
       else
         {
-          [self sendReceiptEmailForObject: newEvent
-                           addedAttendees: nil
-                         deletedAttendees: nil
-                         updatedAttendees: nil
-                                operation: EventUpdated];
+          changes = [iCalEventChanges changesFromEvent: oldEvent  toEvent: newEvent];
+          if ([changes hasMajorChanges])
+            [self sendReceiptEmailForObject: newEvent
+                             addedAttendees: nil
+                           deletedAttendees: nil
+                           updatedAttendees: nil
+                                  operation: EventUpdated];
         }
     }  // else of if (isNew) ...