diff --git a/ChangeLog b/ChangeLog
index 22a41f97e..1ff575d84 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-03-12  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
 
+	* OpenChange/MAPIStoreGCSFolder.m (-lastMessageModificationTime):
+	force a synchronisation from here to ensure that the cache is
+	up-to-date.
+
 	* OpenChange/MAPIStoreTypes.m (_reverseCN): fixed used of ull
 	constants on 32 bit platforms.
 
diff --git a/OpenChange/MAPIStoreGCSFolder.m b/OpenChange/MAPIStoreGCSFolder.m
index 6a4298b2b..b27e0a24f 100644
--- a/OpenChange/MAPIStoreGCSFolder.m
+++ b/OpenChange/MAPIStoreGCSFolder.m
@@ -218,6 +218,8 @@ static Class NSNumberK;
   NSDate *value;
   NSNumber *ti;
 
+  [self synchroniseCache];
+
   ti = [[versionsMessage properties]
          objectForKey: @"SyncLastModificationDate"];
   if (ti)