diff --git a/integrator/browser.py b/integrator/browser.py
index 0ecf9bd..ad103ad 100644
--- a/integrator/browser.py
+++ b/integrator/browser.py
@@ -1,5 +1,5 @@
 #
-#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
+#  Copyright (c) 2012 Helmut Merz helmutm@cy55.de
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -18,8 +18,6 @@
 
 """
 View class(es) for integrating external objects.
-
-$Id$
 """
 
 from zope import interface, component
@@ -44,5 +42,7 @@ class ExternalCollectionView(ConceptView):
             cta = adapted(self.context)
             if cta is not None:
                 cta.update()
+            if cta.updateMessage is not None:
+                self.request.form['message'] = cta.updateMessage
         return True
 
diff --git a/integrator/collection.py b/integrator/collection.py
index a6a6670..33c1912 100644
--- a/integrator/collection.py
+++ b/integrator/collection.py
@@ -1,5 +1,5 @@
 #
-#  Copyright (c) 2009 Helmut Merz helmutm@cy55.de
+#  Copyright (c) 2012 Helmut Merz helmutm@cy55.de
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -19,8 +19,6 @@
 """
 Concept adapter(s) for external collections, e.g. a directory in the
 file system.
-
-$Id$
 """
 
 from datetime import datetime
@@ -62,10 +60,12 @@ class ExternalCollectionAdapter(AdapterBase):
     implements(IExternalCollection)
     adapts(IConcept)
 
-    _adapterAttributes = ('context', '__parent__', 'exclude', 'newResources')
+    _adapterAttributes = AdapterBase._adapterAttributes + (
+                            'exclude', 'newResources', 'updateMessage')
     _contextAttributes = list(IExternalCollection) + list(IConcept)
 
     newResources = None
+    updateMessage = None
 
     def getExclude(self):
         return getattr(self.context, '_exclude', None) or []
@@ -102,11 +102,15 @@ class ExternalCollectionAdapter(AdapterBase):
                     directory = provider.getDirectory(self)
                     adobj.storageParams=dict(subdirectory=directory)
                     adobj.externalAddress = addr
+                    # collect error information
+                    if adobj.processingErrors:
+                        message = self.updateMessage or u''
+                        message += u'<br />'.join(adobj.processingErrors)
+                        self.updateMessage = message
                     # force reindexing
                     notify(ObjectModifiedEvent(obj))
             else:
                 new.append(addr)
-        #print '*** new', new
         if new:
             self.newResources = provider.createExtFileObjects(self, new)
             for r in self.newResources:
@@ -206,6 +210,11 @@ class DirectoryCollectionProvider(object):
             )
             adobj = adapted(obj)
             adobj.externalAddress = addr     # must be set last
+            # collect error information
+            if adobj.processingErrors:
+                message = client.updateMessage or u''
+                message += u'<br />'.join(adobj.processingErrors)
+                client.updateMessage = message
             yield obj
 
     def getDirectory(self, client):
diff --git a/integrator/collection_macros.pt b/integrator/collection_macros.pt
index 6df9ca0..8c3e898 100644
--- a/integrator/collection_macros.pt
+++ b/integrator/collection_macros.pt
@@ -7,6 +7,10 @@
   <metal:block use-macro="view/concept_macros/conceptdata">
     <metal:fill tal:condition="item/editable"
                 fill-slot="fields">
+      <div class="error"
+           tal:define="message view/message | request/message | nothing" 
+           tal:condition="message"
+           tal:content="structure message" />
       <metal:block use-macro="view/concept_macros/conceptfields" />
       <form method="post">
         <input type="submit" name="update" value="Update Collection" />
diff --git a/integrator/office/base.py b/integrator/office/base.py
index 92ed93b..d4d86e5 100644
--- a/integrator/office/base.py
+++ b/integrator/office/base.py
@@ -1,5 +1,5 @@
 #
-#  Copyright (c) 2010 Helmut Merz helmutm@cy55.de
+#  Copyright (c) 2012 Helmut Merz helmutm@cy55.de
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -18,8 +18,6 @@
 
 """
 Resource adapter(s) for MS Office files.
-
-$Id$
 """
 
 from datetime import date, datetime, timedelta
@@ -54,11 +52,16 @@ class OfficeFile(ExternalFileAdapter):
 
     implements(IOfficeFile)
 
+    _adapterAttributes = ExternalFileAdapter._adapterAttributes + (
+                                'processingErrors',)
+
     propertyMap = {u'Revision:': 'version'}
     propFileName = 'docProps/custom.xml'
     fileExtensions = ('.docm', '.docx', 'dotm', 'dotx', 'pptx', 'potx', 'ppsx',
                       '.xlsm', '.xlsx', '.xltm', '.xltx')
 
+    processingErrors = []
+
     @Lazy
     def logger(self):
         return getLogger('loops.integrator.office.base.OfficeFile')
@@ -136,7 +139,9 @@ class OfficeFile(ExternalFileAdapter):
             newZf.writestr(self.propFileName, etree.tostring(dom))
             newZf.close()
             shutil.move(newFn, fn)
-        self.update(attributes)
+        errors = self.update(attributes)
+        if errors:
+            self.processingErrors = errors
 
     def update(self, attributes):
         # to be implemented by subclass
@@ -146,10 +151,10 @@ class OfficeFile(ExternalFileAdapter):
 def parseDate(s):
     if not s:
         return None
-    tt = strptime(s, '%Y-%m-%dT%H:%M:%SZ')
-    #try:
-    #    tt = strptime(s, '%Y-%m-%dT%H:%M:%SZ')
-    #except ValueError:
+    try:
+        tt = strptime(s, '%Y-%m-%dT%H:%M:%SZ')
+    except ValueError:
+        return None
     #    try:
     #        tt = strptime(s, '%d.%m.%y')
     #    except ValueError: