diff --git a/SoObjects/Appointments/SOGoAppointmentFolder.m b/SoObjects/Appointments/SOGoAppointmentFolder.m
index 61e4f071a..6591eb3a0 100644
--- a/SoObjects/Appointments/SOGoAppointmentFolder.m
+++ b/SoObjects/Appointments/SOGoAppointmentFolder.m
@@ -3441,7 +3441,7 @@ firstInstanceCalendarDateRange: (NGCalendarDateRange *) fir
           if ([element isKindOfClass: iCalEventK])
             {
               event = (iCalEvent *)element;
-              timezone = [event adjustInContext: self->context];
+              timezone = [event adjustInContext: self->context withTimezones: timezones];
 
               if ([event recurrenceId])
                 {
diff --git a/SoObjects/Appointments/SOGoAppointmentObject.m b/SoObjects/Appointments/SOGoAppointmentObject.m
index 0143992fb..b6367b9e0 100644
--- a/SoObjects/Appointments/SOGoAppointmentObject.m
+++ b/SoObjects/Appointments/SOGoAppointmentObject.m
@@ -1943,7 +1943,7 @@ inRecurrenceExceptionsForEvent: (iCalEvent *) theEvent
     {
       event = [allEvents objectAtIndex: i];
 
-      tz = [event adjustInContext: context];
+      tz = [event adjustInContext: context withTimezones: nil];
       if (tz)
         [rqCalendar addTimeZone: tz];
 
diff --git a/SoObjects/Appointments/iCalEvent+SOGo.h b/SoObjects/Appointments/iCalEvent+SOGo.h
index ea4682d82..cfa351d1b 100644
--- a/SoObjects/Appointments/iCalEvent+SOGo.h
+++ b/SoObjects/Appointments/iCalEvent+SOGo.h
@@ -31,7 +31,7 @@
 - (BOOL) isStillRelevant;
 - (NSTimeInterval) occurenceInterval;
 - (void) updateRecurrenceRulesUntilDate: (NSCalendarDate *) previousEndDate;
-- (iCalTimeZone *) adjustInContext: (WOContext *) context;
+- (iCalTimeZone *) adjustInContext: (WOContext *) context withTimezones: (NSDictionary *) timezones;
 
 @end
 
diff --git a/SoObjects/Appointments/iCalEvent+SOGo.m b/SoObjects/Appointments/iCalEvent+SOGo.m
index 005dd2a36..1710a91c7 100644
--- a/SoObjects/Appointments/iCalEvent+SOGo.m
+++ b/SoObjects/Appointments/iCalEvent+SOGo.m
@@ -446,6 +446,7 @@
 }
 
 - (iCalTimeZone *) adjustInContext: (WOContext *) context
+                     withTimezones: (NSDictionary *) timezones
 {
   iCalDateTime *startDate, *endDate;
   iCalTimeZone *timezone;
@@ -484,6 +485,9 @@
       if ([timezoneId length])
         {
           timezone = [iCalTimeZone timeZoneForName: timezoneId];
+          // Fallback to tz (VTIMEZONE) found in the ics.
+          if (!timezone)
+            timezone = [timezones valueForKey: timezoneId];
         }
       else
         {