diff --git a/pyproject.toml b/pyproject.toml
index 915e288..cd08dd2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "govoplan-postbox"
-version = "0.1.21"
+version = "0.1.22"
 description = "Function-bound institutional postboxes for GovOPlaN."
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/src/govoplan_postbox/__init__.py b/src/govoplan_postbox/__init__.py
index fd3d430..17d3fe2 100644
--- a/src/govoplan_postbox/__init__.py
+++ b/src/govoplan_postbox/__init__.py
@@ -1,3 +1,3 @@
 """GovOPlaN Postbox module."""
 
-__version__ = "0.1.21"
+__version__ = "0.1.22"
diff --git a/src/govoplan_postbox/backend/manifest.py b/src/govoplan_postbox/backend/manifest.py
index 5eb1550..45f4599 100644
--- a/src/govoplan_postbox/backend/manifest.py
+++ b/src/govoplan_postbox/backend/manifest.py
@@ -34,7 +34,9 @@ from govoplan_core.core.modules import (
     ModuleManifest,
     NavItem,
     PermissionDefinition,
+    ProductAvailabilityExplanation,
     ProductAreaContribution,
+    ProductSurfaceContribution,
     QuickAccessTool,
     RoleTemplate,
 )
@@ -75,7 +77,7 @@ from govoplan_postbox.backend.permissions import (
 
 MODULE_ID = "postbox"
 MODULE_NAME = "Postbox"
-MODULE_VERSION = "0.1.21"
+MODULE_VERSION = "0.1.22"
 
 
 def _permission(scope: str, label: str, description: str) -> PermissionDefinition:
@@ -404,6 +406,40 @@ manifest = ModuleManifest(
                 order=40,
             ),
         ),
+        product_surfaces=(
+            ProductSurfaceContribution(
+                id="communication.messages",
+                module_id=MODULE_ID,
+                label="i18n:govoplan-core.product_surface.messages",
+                description="i18n:govoplan-core.product_surface.messages_description",
+                icon="mail",
+                entry_path="/messages",
+                route_path="/postbox",
+                surface_ids=("postbox.nav.postbox", "postbox.route.postbox"),
+                presentations=("task", "reader"),
+                capability_ids=(CAPABILITY_POSTBOX_MESSAGES,),
+                search_source_ids=("postbox.messages",),
+                help_context_ids=("postbox.quick_access.messages",),
+                documentation_topic_ids=("postbox.quick-access-and-product-area",),
+                required_any=(READ_SCOPE,),
+                aliases=("/inbox",),
+                order=20,
+                unavailable=ProductAvailabilityExplanation(
+                    reason="authorization",
+                    title="i18n:govoplan-core.product_surface.messages_unavailable",
+                    description="i18n:govoplan-core.product_surface.messages_unavailable_description",
+                    resolution="i18n:govoplan-core.product_surface.messages_unavailable_resolution",
+                    responsible_role="i18n:govoplan-core.access_administrator",
+                ),
+                degraded=ProductAvailabilityExplanation(
+                    reason="provider_degraded",
+                    title="i18n:govoplan-core.product_surface.messages_degraded",
+                    description="i18n:govoplan-core.product_surface.messages_degraded_description",
+                    resolution="i18n:govoplan-core.product_surface.messages_degraded_resolution",
+                    responsible_role="i18n:govoplan-core.integration_operator",
+                ),
+            ),
+        ),
         quick_access_tools=(
             QuickAccessTool(
                 id="postbox.messages",
@@ -623,7 +659,11 @@ manifest = ModuleManifest(
             summary="Use function-bound Postboxes in Communication and the shared Messages Quick Access drawer.",
             body=(
                 "Postbox contributes its inbox to Communication. With Quick Access enabled, its owner-rendered surface lists at most "
-                "seven currently readable unread messages beside independent Mail and future chat providers. Selecting or opening a "
+                "seven currently readable unread messages beside independent Mail and future chat providers. "
+                "The stable `/messages` product entry and `/inbox` migration alias select Postbox only when its route is "
+                "currently authorized and visible in the effective View; otherwise another Messages owner is selected or the shell "
+                "explains how access can be restored. "
+                "Selecting or opening a "
                 "message returns a typed Postbox reference; accounts with message-write permission can launch the full owner-rendered "
                 "composer for a currently accessible function Postbox. Directory, message, and submission calls recheck the active "
                 "assignment or acting context. Function assignment, classification, read-receipt, retention, encryption, and evidence "
@@ -640,6 +680,9 @@ manifest = ModuleManifest(
                     "body": (
                         "Postbox ordnet seinen Eingang Kommunikation zu. Ist der Schnellzugriff aktiviert, erscheint die vom Modul gerenderte "
                         "Oberfläche mit höchstens sieben aktuell lesbaren ungelesenen Nachrichten neben unabhängigen Beiträgen aus Mail. "
+                        "Der stabile Produkteinstieg `/messages` und der Migrationsalias `/inbox` wählen Postbox nur, wenn seine Route "
+                        "aktuell berechtigt und in der wirksamen View sichtbar ist. Andernfalls wird ein anderer Nachrichten-Eigentümer "
+                        "gewählt oder die Shell erklärt die Wiederherstellung des Zugriffs. "
                         "Auswahl oder Öffnen liefert eine typisierte Postbox-Referenz; mit Schreibberechtigung lässt sich der vollständige "
                         "Editor für ein aktuell zugängliches Funktionspostfach öffnen. Verzeichnis, Nachricht und Versand prüfen die aktive "
                         "Zuweisung beziehungsweise den Handlungskontext erneut. Klassifikation, Lesestatus, Aufbewahrung, Verschlüsselung "
diff --git a/webui/package.json b/webui/package.json
index 46997ff..0eae1fd 100644
--- a/webui/package.json
+++ b/webui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@govoplan/postbox-webui",
-  "version": "0.1.21",
+  "version": "0.1.22",
   "private": true,
   "type": "module",
   "main": "src/index.ts",
diff --git a/webui/src/module.ts b/webui/src/module.ts
index 5ebf01a..181ffb9 100644
--- a/webui/src/module.ts
+++ b/webui/src/module.ts
@@ -1,6 +1,7 @@
 import { createElement, lazy } from "react";
 import {
   hasScope,
+  messagesProductSurfaceTranslations,
   type AdminSectionsUiCapability,
   type DashboardWidgetsUiCapability,
   type PlatformWebModule,
@@ -18,8 +19,8 @@ const PostboxAdminPanel = lazy(
 );
 
 const translations = {
-  en: generatedTranslations.en,
-  de: generatedTranslations.de
+  en: { ...generatedTranslations.en, ...messagesProductSurfaceTranslations.en },
+  de: { ...generatedTranslations.de, ...messagesProductSurfaceTranslations.de }
 };
 
 const readScope = ["postbox:postbox:read"];