diff --git a/api/app.py b/api/app.py
index bb6ebdd..d163fe1 100644
--- a/api/app.py
+++ b/api/app.py
@@ -519,9 +519,18 @@ def perform_health_check():
             'timestamp': datetime.utcnow().isoformat(),
             'alerts': []
         }
-        
+
+        # email/calendar/files are optional store services — only check them when installed
+        _installed_store_ids = set(config_manager.get_installed_services())
+        _OPTIONAL_STORE_MANAGERS = frozenset({'email_manager', 'calendar_manager', 'file_manager'})
+
         # Get health from each service
         for service_name in service_bus.list_services():
+            if service_name in _OPTIONAL_STORE_MANAGERS:
+                # Map manager name to store service id (strip _manager suffix)
+                store_id = service_name.replace('_manager', '')
+                if store_id not in _installed_store_ids:
+                    continue
             try:
                 service = service_bus.get_service(service_name)
                 if hasattr(service, 'health_check'):
@@ -531,7 +540,7 @@ def perform_health_check():
                 result[service_name] = health
             except Exception as e:
                 result[service_name] = {'error': str(e), 'status': 'offline'}
-        
+
         # Health alerting logic — alert only when a service container is not running
         global service_alert_counters
         for service_name in service_bus.list_services():
diff --git a/api/routes/service_store.py b/api/routes/service_store.py
index b17c3ad..dcbf4bc 100644
--- a/api/routes/service_store.py
+++ b/api/routes/service_store.py
@@ -62,6 +62,10 @@ def install_service(service_id: str):
         result = _ssm().install(service_id)
         if result.get('ok'):
             return jsonify(result)
+        # Normalize docker compose stderr into the error key so the frontend
+        # can display the actual failure reason rather than a generic message.
+        if not result.get('error') and result.get('stderr'):
+            result = {**result, 'error': result['stderr']}
         return jsonify(result), 400
     except Exception as e:
         logger.error(f'install_service({service_id}): {e}')
diff --git a/docker-compose.services.yml b/docker-compose.services.yml
index f5772f5..0189ff2 100644
--- a/docker-compose.services.yml
+++ b/docker-compose.services.yml
@@ -3,4 +3,4 @@ services: {}
 networks:
   cell-network:
     external: true
-    name: pic_cell-network
+    name: cell-network
diff --git a/webui/src/pages/Logs.jsx b/webui/src/pages/Logs.jsx
index de8d5e9..7f3e080 100644
--- a/webui/src/pages/Logs.jsx
+++ b/webui/src/pages/Logs.jsx
@@ -392,7 +392,7 @@ function HealthHistoryTab() {
           <table className="min-w-full text-sm">
             <thead>
               <tr className="bg-gray-100">
-                {['Timestamp','Network','WireGuard','Email','Calendar','Files','Routing','Vault','Alerts'].map(h => (
+                {['Timestamp','Network','WireGuard','Routing','Vault','Alerts'].map(h => (
                   <th key={h} className="px-2 py-1 text-left">{h}</th>
                 ))}
               </tr>
@@ -403,9 +403,6 @@ function HealthHistoryTab() {
                   <td className="px-2 py-1 font-mono text-xs">{h.timestamp}</td>
                   <td className="px-2 py-1"><SvcCol data={h.network} /></td>
                   <td className="px-2 py-1"><SvcCol data={h.wireguard} /></td>
-                  <td className="px-2 py-1"><SvcCol data={h.email} /></td>
-                  <td className="px-2 py-1"><SvcCol data={h.calendar} /></td>
-                  <td className="px-2 py-1"><SvcCol data={h.files} /></td>
                   <td className="px-2 py-1"><SvcCol data={h.routing} /></td>
                   <td className="px-2 py-1"><SvcCol data={h.vault} /></td>
                   <td className="px-2 py-1">