diff --git a/ChangeLog b/ChangeLog
index 42ba7cbb0..43d3f3334 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2012-03-13  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
 
+	* OpenChange/MAPIStoreCalendarFolder.m
+	(-getPidTagDefaultPostMessageClass:inMemCtx:): new getter.
+
 	* OpenChange/MAPIStoreFolder.m
 	(_modifyPermissionEntryForUser:withRoles:isAddition:withACLFolder:):
 	skip any modification when user is nil.
diff --git a/OpenChange/MAPIStoreCalendarFolder.m b/OpenChange/MAPIStoreCalendarFolder.m
index 7b40d9735..f50b0358c 100644
--- a/OpenChange/MAPIStoreCalendarFolder.m
+++ b/OpenChange/MAPIStoreCalendarFolder.m
@@ -35,9 +35,11 @@
 #import "MAPIStoreCalendarContext.h"
 #import "MAPIStoreCalendarMessage.h"
 #import "MAPIStoreCalendarMessageTable.h"
+#import "NSString+MAPIStore.h"
 
 #import "MAPIStoreCalendarFolder.h"
 
+#include <mapistore/mapistore_errors.h>
 #include <util/time.h>
 #include <gen_ndr/exchange.h>
 
@@ -162,4 +164,13 @@
             [(SOGoAppointmentFolder *) sogoObject aclSQLListingFilter]];
 }
 
+- (int) getPidTagDefaultPostMessageClass: (void **) data
+                                inMemCtx: (TALLOC_CTX *) memCtx
+{
+  *data = [@"IPM.Appointment" asUnicodeInMemCtx: memCtx];
+
+  return MAPISTORE_SUCCESS;
+}
+
+
 @end