diff --git a/app/src/main/java/at/bitfire/davdroid/resource/Event.java b/app/src/main/java/at/bitfire/davdroid/resource/Event.java
index 767c78bc..126203e1 100644
--- a/app/src/main/java/at/bitfire/davdroid/resource/Event.java
+++ b/app/src/main/java/at/bitfire/davdroid/resource/Event.java
@@ -293,8 +293,6 @@ public class Event extends iCalendar {
 			event.getProperties().add(forPublic ? Clazz.PUBLIC : Clazz.PRIVATE);
 
 		event.getAlarms().addAll(alarms);
-
-		props.add(new LastModified());
 		return event;
 	}
 
diff --git a/app/src/main/java/at/bitfire/davdroid/resource/LocalCalendar.java b/app/src/main/java/at/bitfire/davdroid/resource/LocalCalendar.java
index 56a8d426..13245c8f 100644
--- a/app/src/main/java/at/bitfire/davdroid/resource/LocalCalendar.java
+++ b/app/src/main/java/at/bitfire/davdroid/resource/LocalCalendar.java
@@ -425,12 +425,13 @@ public class LocalCalendar extends LocalCollection<Event> {
 		// availability
 		e.opaque = values.getAsInteger(Events.AVAILABILITY) != Events.AVAILABILITY_FREE;
 
-		// set ORGANIZER
-		try {
-			e.organizer = new Organizer(new URI("mailto", values.getAsString(Events.ORGANIZER), null));
-		} catch (URISyntaxException ex) {
-			Log.e(TAG, "Error when creating ORGANIZER mailto URI, ignoring", ex);
-		}
+		// set ORGANIZER if there's attendee data
+		if (values.getAsInteger(Events.HAS_ATTENDEE_DATA) != 0)
+			try {
+				e.organizer = new Organizer(new URI("mailto", values.getAsString(Events.ORGANIZER), null));
+			} catch (URISyntaxException ex) {
+				Log.e(TAG, "Error when creating ORGANIZER mailto URI, ignoring", ex);
+			}
 
 		// classification
 		switch (values.getAsInteger(Events.ACCESS_LEVEL)) {
@@ -553,8 +554,8 @@ public class LocalCalendar extends LocalCollection<Event> {
 					.withValue(entryColumnETag(), event.getETag())
 					.withValue(entryColumnUID(), event.getUid());
 		} else {
+			// event is an exception
 			builder.withValue(Events.ORIGINAL_SYNC_ID, event.getName());
-
 			// ORIGINAL_INSTANCE_TIME and ORIGINAL_ALL_DAY is set in buildExceptions.
 			// It's not possible to use only the RECURRENCE-ID to calculate
 			// ORIGINAL_INSTANCE_TIME and ORIGINAL_ALL_DAY because iCloud sends DATE-TIME
@@ -616,7 +617,6 @@ public class LocalCalendar extends LocalCollection<Event> {
 			builder.withValue(Events.ORGANIZER, email != null ? email : uri.toString());
 		}
 
-		//Status status = event.getStatus();
 		if (event.status!= null) {
 			int statusCode = Events.STATUS_TENTATIVE;
 			if (event.status == Status.VEVENT_CONFIRMED)
@@ -639,15 +639,15 @@ public class LocalCalendar extends LocalCollection<Event> {
 	protected void addDataRows(Resource resource, long localID, int backrefIdx) {
 		final Event event = (Event)resource;
 
-		// add exceptions
-		for (Event exception : event.getExceptions())
-			pendingOperations.add(buildException(newDataInsertBuilder(Events.CONTENT_URI, Events.ORIGINAL_ID, localID, backrefIdx), event, exception).build());
 		// add attendees
 		for (Attendee attendee : event.getAttendees())
 			pendingOperations.add(buildAttendee(newDataInsertBuilder(Attendees.CONTENT_URI, Attendees.EVENT_ID, localID, backrefIdx), attendee).build());
 		// add reminders
 		for (VAlarm alarm : event.getAlarms())
 			pendingOperations.add(buildReminder(newDataInsertBuilder(Reminders.CONTENT_URI, Reminders.EVENT_ID, localID, backrefIdx), alarm).build());
+		// add exceptions
+		for (Event exception : event.getExceptions())
+			pendingOperations.add(buildException(newDataInsertBuilder(Events.CONTENT_URI, Events.ORIGINAL_ID, localID, backrefIdx), event, exception).build());
 	}
 	
 	@Override
@@ -668,7 +668,6 @@ public class LocalCalendar extends LocalCollection<Event> {
 
 	protected Builder buildException(Builder builder, Event master, Event exception) {
 		buildEntry(builder, exception, false);
-		builder.withValue(Events.ORIGINAL_SYNC_ID, exception.getName());
 
 		final boolean originalAllDay = master.isAllDay();
 
@@ -685,12 +684,16 @@ public class LocalCalendar extends LocalCollection<Event> {
 
 		builder.withValue(Events.ORIGINAL_INSTANCE_TIME, date.getTime());
 		builder.withValue(Events.ORIGINAL_ALL_DAY, originalAllDay ? 1 : 0);
+
+		/* TODO reminders and attendees for exceptions are currently not built because
+		 * there's no backref index available */
+
 		return builder;
 	}
 	
 	@SuppressLint("InlinedApi")
 	protected Builder buildAttendee(Builder builder, Attendee attendee) {
-		final Uri member = Uri.parse(attendee.getValue());
+		final URI member = attendee.getCalAddress();
 		if ("mailto".equalsIgnoreCase(member.getScheme()))
 			// attendee identified by email
 			builder = builder.withValue(Attendees.ATTENDEE_EMAIL, member.getSchemeSpecificPart());
@@ -760,7 +763,6 @@ public class LocalCalendar extends LocalCollection<Event> {
 		}
 
 		Log.d(TAG, "Adding alarm " + minutes + " minutes before");
-
 		return builder
 				.withValue(Reminders.METHOD, Reminders.METHOD_ALERT)
 				.withValue(Reminders.MINUTES, minutes);
diff --git a/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncManager.java b/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncManager.java
index be0193a4..b4ca1aa1 100644
--- a/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncManager.java
+++ b/app/src/main/java/at/bitfire/davdroid/syncadapter/SyncManager.java
@@ -23,6 +23,7 @@ import at.bitfire.davdroid.resource.Resource;
 import at.bitfire.davdroid.resource.WebDavCollection;
 import at.bitfire.davdroid.webdav.ConflictException;
 import at.bitfire.davdroid.webdav.DavException;
+import at.bitfire.davdroid.webdav.ForbiddenException;
 import at.bitfire.davdroid.webdav.HttpException;
 import at.bitfire.davdroid.webdav.NotFoundException;
 import at.bitfire.davdroid.webdav.PreconditionFailedException;
@@ -119,11 +120,10 @@ public class SyncManager {
 							remote.delete(res);
 						} catch(NotFoundException e) {
 							Log.i(TAG, "Locally-deleted resource has already been removed from server");
-						} catch(PreconditionFailedException e) {
+						} catch(PreconditionFailedException|ConflictException e) {
 							Log.i(TAG, "Locally-deleted resource has been changed on the server in the meanwhile");
 						}
-					
-					// always delete locally so that the record with the DELETED flag doesn't cause another deletion attempt
+
 					local.delete(res);
 					
 					count++;
@@ -149,7 +149,7 @@ public class SyncManager {
 						local.updateETag(res, eTag);
 					local.clearDirty(res);
 					count++;
-				} catch (PreconditionFailedException|ConflictException e) {
+				} catch (ConflictException|PreconditionFailedException e) {
                     Log.i(TAG, "Didn't overwrite existing resource with other content");
 				} catch (RecordNotFoundException e) {
 					Log.wtf(TAG, "Couldn't read new record", e);
@@ -173,8 +173,10 @@ public class SyncManager {
 						local.updateETag(res, eTag);
 					local.clearDirty(res);
 					count++;
-				} catch (PreconditionFailedException|ConflictException e) {
-                    Log.i(TAG, "Locally changed resource has been changed on the server in the meanwhile");
+				} catch (ForbiddenException e) {
+					Log.w(TAG, "Server has rejected local changes, server wins", e);
+				} catch (ConflictException|PreconditionFailedException e) {
+                    Log.i(TAG, "Locally changed resource has been changed on the server in the meanwhile", e);
 				} catch (RecordNotFoundException e) {
 					Log.e(TAG, "Couldn't read dirty record", e);
 				}
diff --git a/app/src/main/java/at/bitfire/davdroid/webdav/ForbiddenException.java b/app/src/main/java/at/bitfire/davdroid/webdav/ForbiddenException.java
new file mode 100644
index 00000000..599c12e7
--- /dev/null
+++ b/app/src/main/java/at/bitfire/davdroid/webdav/ForbiddenException.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright © 2013 – 2015 Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package at.bitfire.davdroid.webdav;
+
+import org.apache.http.HttpStatus;
+
+public class ForbiddenException extends HttpException {
+	private static final long serialVersionUID = 102282229174086113L;
+
+	public ForbiddenException(String reason) {
+		super(HttpStatus.SC_FORBIDDEN, reason);
+	}
+}
diff --git a/app/src/main/java/at/bitfire/davdroid/webdav/WebDavResource.java b/app/src/main/java/at/bitfire/davdroid/webdav/WebDavResource.java
index 25d0e983..1d47bc4c 100644
--- a/app/src/main/java/at/bitfire/davdroid/webdav/WebDavResource.java
+++ b/app/src/main/java/at/bitfire/davdroid/webdav/WebDavResource.java
@@ -345,6 +345,8 @@ public class WebDavResource {
 		switch (code) {
 		case HttpStatus.SC_UNAUTHORIZED:
 			throw new NotAuthorizedException(reason);
+		case HttpStatus.SC_FORBIDDEN:
+			throw new ForbiddenException(reason);
 		case HttpStatus.SC_NOT_FOUND:
 			throw new NotFoundException(reason);
 		case HttpStatus.SC_CONFLICT:
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 0e10d646..0e34a073 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -76,7 +76,7 @@
 	   <a href="http://davdroid.bitfire.at/donate?pk_campaign=davdroid-app&amp;pk_kwd=main-activity">für DAVdroid spenden</a> oder die App kaufen.</p>
 	   
 	   <h1>Lizenz</h1>
-	   <p>Copyright © 2013 – 2014 Ricki Hirner, Bernhard Stockmann (<a href="http://www.bitfire.at">bitfire web engineering</a>), alle Rechte
+	   <p>Copyright © 2013 – 2015 Ricki Hirner, Bernhard Stockmann (<a href="http://www.bitfire.at">bitfire web engineering</a>), alle Rechte
 	   vorbehalten. Dieses Programm ist freie Software. Sie können es unter den Bedingungen der <a href="http://www.gnu.org/licenses/gpl.html">GNU
 	   General Public License Version 3</a>, wie von der Free Software Foundation veröffentlicht, weitergeben und/oder modifizieren.
 	   Sofern Google Play oder Samsung Store andere Bedingungen benötigen, gelten für über den jeweiligen Markt heruntergeladene