diff --git a/src/main/java/envoy/client/data/Chat.java b/src/main/java/envoy/client/data/Chat.java
index f10e816..49083a7 100644
--- a/src/main/java/envoy/client/data/Chat.java
+++ b/src/main/java/envoy/client/data/Chat.java
@@ -3,7 +3,7 @@ package envoy.client.data;
 import java.io.IOException;
 import java.io.Serializable;
 
-import envoy.client.net.Client;
+import envoy.client.net.WriteProxy;
 import envoy.client.ui.list.ComponentListModel;
 import envoy.data.Message;
 import envoy.data.Message.MessageStatus;
@@ -52,22 +52,20 @@ public class Chat implements Serializable {
 	 * {@code READ} starting from the bottom and stopping once a read message is
 	 * found.
 	 *
-	 * @param client the client instance used to notify the server about the message
-	 *               status changes
+	 * @param writeProxy the write proxy instance used to notify the server about
+	 *                   the message status changes
 	 * @throws IOException if a {@link MessageStatusChangeEvent} could not be
 	 *                     delivered to the server
 	 * @since Envoy v0.3-alpha
 	 */
-	public void read(Client client) throws IOException {
+	public void read(WriteProxy writeProxy) throws IOException {
 		for (int i = model.size() - 1; i >= 0; --i) {
 			final Message m = model.get(i);
 			if (m.getSenderId() == recipient.getId()) {
 				if (m.getStatus() == MessageStatus.READ) break;
 				else {
 					m.setStatus(MessageStatus.READ);
-
-					// TODO: Cache events in offline mode
-					client.sendEvent(new MessageStatusChangeEvent(m));
+					writeProxy.writeMessageStatusChangeEvent(new MessageStatusChangeEvent(m));
 				}
 			}
 		}
diff --git a/src/main/java/envoy/client/ui/ChatWindow.java b/src/main/java/envoy/client/ui/ChatWindow.java
index 3abd54a..7d537bf 100644
--- a/src/main/java/envoy/client/ui/ChatWindow.java
+++ b/src/main/java/envoy/client/ui/ChatWindow.java
@@ -16,6 +16,7 @@ import envoy.client.data.LocalDb;
 import envoy.client.event.MessageCreationEvent;
 import envoy.client.event.ThemeChangeEvent;
 import envoy.client.net.Client;
+import envoy.client.net.WriteProxy;
 import envoy.client.ui.list.ComponentList;
 import envoy.client.ui.settings.SettingsScreen;
 import envoy.client.util.EnvoyLog;
@@ -39,8 +40,9 @@ import envoy.event.MessageStatusChangeEvent;
 public class ChatWindow extends JFrame {
 
 	// User specific objects
-	private Client	client;
-	private LocalDb	localDb;
+	private Client		client;
+	private WriteProxy	writeProxy;
+	private LocalDb		localDb;
 
 	// GUI components
 	private JPanel					contentPane				= new JPanel();
@@ -211,7 +213,7 @@ public class ChatWindow extends JFrame {
 
 		// Listen to received messages
 		EventBus.getInstance().register(MessageCreationEvent.class, (evt) -> {
-			Message message = ((MessageCreationEvent) evt).get();
+			Message	message	= ((MessageCreationEvent) evt).get();
 			Chat	chat	= localDb.getChats().stream().filter(c -> c.getRecipient().getId() == message.getSenderId()).findFirst().get();
 			chat.appendMessage(message);
 
@@ -301,8 +303,7 @@ public class ChatWindow extends JFrame {
 				.build();
 
 			// Send message
-			// TODO: Store offline messages
-			client.sendMessage(message);
+			writeProxy.writeMessage(message);
 
 			// Add message to PersistentLocalDb and update UI
 			currentChat.appendMessage(message);
@@ -345,7 +346,7 @@ public class ChatWindow extends JFrame {
 
 	private void readCurrentChat() {
 		try {
-			currentChat.read(client);
+			currentChat.read(writeProxy);
 			messageList.synchronizeModel();
 		} catch (IOException e) {
 			e.printStackTrace();
@@ -354,24 +355,23 @@ public class ChatWindow extends JFrame {
 	}
 
 	/**
-	 * Sets the {@link Client} used by this {@link ChatWindow}.
+	 * Initializes the components responsible server communication and
+	 * persistence.<br>
+	 * <br>
+	 * This will trigger the display of the contact list.
 	 *
-	 * @param client the {@link Client} used to send and receive messages
-	 * @since Envoy v0.2-alpha
+	 * @param client     the client used to send and receive messages
+	 * @param localDb    the local database used to manage stored messages
+	 *                   and users
+	 * @param writeProxy the write proxy used to send messages and status change
+	 *                   events to the server or cache them inside the local
+	 *                   database
+	 * @since Envoy v0.3-alpha
 	 */
-	public void setClient(Client client) { this.client = client; }
-
-	/**
-	 * Sets the {@link LocalDb} used by this {@link ChatWindow}. After
-	 * invoking this
-	 * method, users and chats will be loaded from the database into the GUI.
-	 *
-	 * @param localDb the {@link LocalDb} used to manage stored messages
-	 *                and users
-	 * @since Envoy v0.2-alpha
-	 */
-	public void setLocalDB(LocalDb localDb) {
-		this.localDb = localDb;
+	public void initContent(Client client, LocalDb localDb, WriteProxy writeProxy) {
+		this.client		= client;
+		this.localDb	= localDb;
+		this.writeProxy	= writeProxy;
 		loadUsersAndChats();
 	}
 }
diff --git a/src/main/java/envoy/client/ui/Startup.java b/src/main/java/envoy/client/ui/Startup.java
index 1a38da9..1c68e41 100644
--- a/src/main/java/envoy/client/ui/Startup.java
+++ b/src/main/java/envoy/client/ui/Startup.java
@@ -15,6 +15,7 @@ import envoy.client.Config;
 import envoy.client.Settings;
 import envoy.client.data.*;
 import envoy.client.net.Client;
+import envoy.client.net.WriteProxy;
 import envoy.client.util.EnvoyLog;
 import envoy.data.LoginCredentials;
 import envoy.data.Message;
@@ -148,14 +149,19 @@ public class Startup {
 					JOptionPane.WARNING_MESSAGE);
 		}
 
-		// Save all users to the local database
-		if (client.isOnline()) localDb.setUsers(client.getUsers());
+		// Initialize write proxy
+		final WriteProxy writeProxy = client.createWriteProxy(localDb);
+
+		// Save all users to the local database and flush cache
+		if (client.isOnline()) {
+			localDb.setUsers(client.getUsers());
+			writeProxy.flushCache();
+		}
 
 		// Display ChatWindow and StatusTrayIcon
 		EventQueue.invokeLater(() -> {
 			try {
-				chatWindow.setClient(client);
-				chatWindow.setLocalDB(localDb);
+				chatWindow.initContent(client, localDb, writeProxy);
 
 				try {
 					new StatusTrayIcon(chatWindow).show();