diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/AcknowledgeChange.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/AcknowledgeChange.java
index 20adf6af0..c423a86c5 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/AcknowledgeChange.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/AcknowledgeChange.java
@@ -1,17 +1,62 @@
 package com.todoroo.astrid.actfm.sync.messages;
 
+import java.util.ArrayList;
+
+import org.json.JSONArray;
+import org.json.JSONException;
 import org.json.JSONObject;
 
+import android.text.TextUtils;
+
+import com.todoroo.andlib.data.AbstractModel;
+import com.todoroo.andlib.service.Autowired;
+import com.todoroo.andlib.service.DependencyInjectionService;
+import com.todoroo.astrid.dao.OutstandingEntryDao;
+import com.todoroo.astrid.dao.TagOutstandingDao;
+import com.todoroo.astrid.dao.TaskOutstandingDao;
+
 public class AcknowledgeChange extends ServerToClientMessage {
 
+    @Autowired
+    private TaskOutstandingDao taskOutstandingDao;
+
+    @Autowired
+    private TagOutstandingDao tagOutstandingDao;
+
     public AcknowledgeChange(JSONObject json) {
         super(json);
-        throw new RuntimeException("No constructor for AcknowledgeChange implemented"); //$NON-NLS-1$
+        DependencyInjectionService.getInstance().inject(this);
     }
 
     @Override
+    @SuppressWarnings("nls")
     public void processMessage() {
-        // TODO Auto-generated method stub
+        JSONArray idsArray = json.optJSONArray("ids");
+        String table = json.optString("table");
+        if (idsArray != null && !TextUtils.isEmpty(table)) {
+            OutstandingEntryDao<?> dao = null;
+            if (NameMaps.SERVER_TABLE_TASKS.equals(table))
+                dao = taskOutstandingDao;
+            else if (NameMaps.SERVER_TABLE_TAGS.equals(table))
+                dao = tagOutstandingDao;
+
+            if (dao == null)
+                return;
+
+            ArrayList<Long> idsList = new ArrayList<Long>();
+            for (int i = 0; i < idsArray.length(); i++) {
+                try {
+                    Long id = idsArray.getLong(i);
+                    if (id <= 0)
+                        continue;
+
+                    idsList.add(id);
+                } catch (JSONException e) {
+                    //
+                }
+            }
+            dao.deleteWhere(AbstractModel.ID_PROPERTY.in(idsList.toArray(new Long[idsList.size()])));
+        }
     }
 
 }
diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/NameMaps.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/NameMaps.java
index b05e7d657..4c2552ec7 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/NameMaps.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/NameMaps.java
@@ -18,12 +18,16 @@ public class NameMaps {
     private static final Map<Table, String> TABLE_LOCAL_TO_SERVER;
     private static final Map<String, Table> TABLE_SERVER_TO_LOCAL;
 
+    public static final String SERVER_TABLE_TASKS = "tasks";
+    public static final String SERVER_TABLE_TAGS = "tags";
+    public static final String SERVER_TABLE_USERS = "users";
+
     static {
         // Hardcoded local tables mapped to corresponding server names
         TABLE_LOCAL_TO_SERVER = new HashMap<Table, String>();
-        TABLE_LOCAL_TO_SERVER.put(Task.TABLE, "tasks");
-        TABLE_LOCAL_TO_SERVER.put(TagData.TABLE, "tags");
-        TABLE_LOCAL_TO_SERVER.put(User.TABLE, "users");
+        TABLE_LOCAL_TO_SERVER.put(Task.TABLE, SERVER_TABLE_TASKS);
+        TABLE_LOCAL_TO_SERVER.put(TagData.TABLE, SERVER_TABLE_TAGS);
+        TABLE_LOCAL_TO_SERVER.put(User.TABLE, SERVER_TABLE_USERS);
 
         // Reverse the mapping to construct the server to local map
         TABLE_SERVER_TO_LOCAL = AndroidUtilities.reverseMap(TABLE_LOCAL_TO_SERVER);
diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ServerToClientMessage.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ServerToClientMessage.java
index fbb4bdf98..47f21ab48 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ServerToClientMessage.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ServerToClientMessage.java
@@ -12,9 +12,10 @@ public abstract class ServerToClientMessage {
     private static final String TYPE_DOUBLE_CHECK = "DoubleCheck";
     private static final String TYPE_DEBUG = "Debug";
 
-    @SuppressWarnings("unused")
+    protected final JSONObject json;
+
     public ServerToClientMessage(JSONObject json) {
-        //
+        this.json = json;
     }
 
     public static ServerToClientMessage instantiateMessage(JSONObject json) {