diff -u orage-4.4.1.orig/src/ical-code.c orage-4.4.1/src/ical-code.c
--- orage-4.4.1.orig/src/ical-code.c	2007-04-06 22:19:22.000000000 +0200
+++ orage-4.4.1/src/ical-code.c	2007-08-05 10:30:43.738608668 +0200
@@ -1290,6 +1290,7 @@
            , icalproperty_new_categories("ORAGENOTE")
            , icalproperty_new_class(ICAL_CLASS_PUBLIC)
            , icalproperty_new_dtstamp(dtstamp)
+           , icalproperty_new_lastmodified(dtstamp)
            , icalproperty_new_created(create_time)
            , NULL);
 
@@ -1745,6 +1746,7 @@
                     case ICAL_CLASS_PROPERTY:
                     case ICAL_DTSTAMP_PROPERTY:
                     case ICAL_CREATED_PROPERTY:
+                    case ICAL_LASTMODIFIED_PROPERTY:
                         break;
                     default:
                         g_warning("xfical_appt_get_internal: unknown property %s"