diff --git a/src/Moryx.Notifications/INotificationPublisher.cs b/src/Moryx.Notifications/INotificationPublisher.cs
index 75914e97..f4997560 100644
--- a/src/Moryx.Notifications/INotificationPublisher.cs
+++ b/src/Moryx.Notifications/INotificationPublisher.cs
@@ -1,4 +1,4 @@
-// Copyright (c) 2020, Phoenix Contact GmbH & Co. KG
+// Copyright (c) 2022, Phoenix Contact GmbH & Co. KG
 // Licensed under the Apache License, Version 2.0
 
 using System;
@@ -8,6 +8,7 @@ namespace Moryx.Notifications
     /// <summary>
     /// Notification publisher facade
     /// </summary>
+    [Obsolete]
     public interface INotificationPublisher
     {
         /// <summary>
diff --git a/src/Moryx.Notifications/INotificationPublisherExtended.cs b/src/Moryx.Notifications/INotificationPublisherExtended.cs
new file mode 100644
index 00000000..c1adcbcf
--- /dev/null
+++ b/src/Moryx.Notifications/INotificationPublisherExtended.cs
@@ -0,0 +1,42 @@
+// Copyright (c) 2022, Phoenix Contact GmbH & Co. KG
+// Licensed under the Apache License, Version 2.0
+
+using System;
+
+namespace Moryx.Notifications
+{
+    /// <summary>
+    /// Notification publisher facade
+    /// </summary>
+    public interface INotificationPublisherExtended
+    {
+        /// <summary>
+        /// Returns all active notifications
+        /// </summary>
+        Notification[] GetAll();
+
+        /// <summary>
+        /// Gets a <see cref="Notification"/> corresponding to a specific <paramref name="id"/>
+        /// If this is an inactive <see cref="Notification"/>, than the NotificationHistory will be used to search for the asked <see cref="Notification"/>
+        /// </summary>
+        /// <param name="id">Id of the desired <see cref="Notification"/></param>
+        /// <returns>A <see cref="Notification"/> correspodning to the given id if it exists; null otherwise</returns>
+        Notification Get(Guid id);
+
+        /// <summary>
+        /// Acknowledge the given Notificatione
+        /// </summary>
+        /// <param name="notification">The notification to be acknowledged</param>
+        void Acknowledge(Notification notification);
+
+        /// <summary>
+        /// Raised if notification was published
+        /// </summary>
+        event EventHandler<Notification> Published;
+
+        /// <summary>
+        /// Raised if notification was acknowledged
+        /// </summary>
+        event EventHandler<Notification> Acknowledged;
+    }
+}
diff --git a/src/Moryx.Notifications/Notification/INotification.cs b/src/Moryx.Notifications/Notification/INotification.cs
index 07e3a7a4..e8a04993 100644
--- a/src/Moryx.Notifications/Notification/INotification.cs
+++ b/src/Moryx.Notifications/Notification/INotification.cs
@@ -1,4 +1,4 @@
-// Copyright (c) 2020, Phoenix Contact GmbH & Co. KG
+// Copyright (c) 2022, Phoenix Contact GmbH & Co. KG
 // Licensed under the Apache License, Version 2.0
 
 using System;
@@ -8,6 +8,7 @@ namespace Moryx.Notifications
     /// <summary>
     /// Additional notification interface to manipulate the notification properties in managing plugins
     /// </summary>
+    [Obsolete]
     public interface IManagedNotification : INotification
     {
         /// <summary>
@@ -72,6 +73,7 @@ public interface IManagedNotification : INotification
     /// <summary>
     /// Message for a consumer
     /// </summary>
+    [Obsolete]
     public interface INotification
     {
         /// <summary>
diff --git a/src/Moryx.Notifications/Notification/Notification.cs b/src/Moryx.Notifications/Notification/Notification.cs
index a905d11c..9e38189c 100644
--- a/src/Moryx.Notifications/Notification/Notification.cs
+++ b/src/Moryx.Notifications/Notification/Notification.cs
@@ -1,4 +1,4 @@
-// Copyright (c) 2020, Phoenix Contact GmbH & Co. KG
+// Copyright (c) 2022, Phoenix Contact GmbH & Co. KG
 // Licensed under the Apache License, Version 2.0
 
 using System;
@@ -14,56 +14,67 @@ public class Notification : IManagedNotification
         public Guid Identifier { get; private set; }
 
         /// <inheritdoc />
-        Guid IManagedNotification.Identifier
-        {
-            get => Identifier;
-            set => Identifier = value;
-        }
+        public Severity Severity { get; set; }
 
         /// <inheritdoc />
-        public DateTime? Acknowledged { get; private set; }
-
-        DateTime? IManagedNotification.Acknowledged
-        {
-            get => Acknowledged;
-            set => Acknowledged = value;
-        }
-
-        /// <inheritdoc cref="IManagedNotification.IsAcknowledgable" />
-        public bool IsAcknowledgable { get; set; }
+        public string Title { get; set; }
 
         /// <inheritdoc />
-        public string Acknowledger { get; private set; }
-
-        string IManagedNotification.Acknowledger
-        {
-            get => Acknowledger;
-            set => Acknowledger = value;
-        }
-
+        public string Message { get; set; }
+        
         /// <inheritdoc />
-        public DateTime Created { get; private set; }
-
-        DateTime IManagedNotification.Created
-        {
-            get => Created;
-            set => Created = value;
-        }
+        public string Sender { get; set; }
 
         /// <inheritdoc />
-        string IManagedNotification.Sender { get; set; }
+        public string Source { get; set; }
 
         /// <inheritdoc />
-        string IManagedNotification.Source { get; set; }
+        public bool IsAcknowledgable { get; set; }
 
+        // TODO: AL6 remove explicit backing attribute for property
+        private DateTime? _acknowledged;
         /// <inheritdoc />
-        public Severity Severity { get; set; }
+        public virtual DateTime? Acknowledged 
+        { 
+            get => _acknowledged; 
+            set 
+            {
+                if (_acknowledged is null)
+                    _acknowledged = value;
+                else
+                    throw new InvalidOperationException("Tried to update time of acknowledgement.");
+            } 
+        }
 
+        // TODO: AL6 remove explicit backing attribute for property
+        private string _acknowledger;
         /// <inheritdoc />
-        public string Title { get; set; }
+        public virtual string Acknowledger
+        {
+            get => _acknowledger;
+            set
+            {
+                if (_acknowledger is null)
+                    _acknowledger = value;
+                else
+                    throw new InvalidOperationException("Tried to update time acknowledger.");
+            }
+        }
 
+        // TODO: AL6 Remove backing attribute for property and make property nullable
+        private DateTime? _created;
         /// <inheritdoc />
-        public string Message { get; set; }
+        public virtual DateTime Created
+        {
+            get => _created ?? default(DateTime);
+            set
+            {
+                if (_created is null)
+                    _created = value;
+                else
+                    throw new InvalidOperationException("Tried to update creation time.");
+            }
+        }
 
         /// <summary>
         /// Creates a new notification
@@ -75,6 +86,7 @@ public Notification()
         /// <summary>
         /// Creates a new notification with title and message
         /// </summary>
+        [Obsolete]
         public Notification(string title, string message, Severity severity) : this()
         {
             Title = title;
@@ -85,9 +97,43 @@ public Notification(string title, string message, Severity severity) : this()
         /// <summary>
         /// Creates a new notification with title and message
         /// </summary>
+        [Obsolete]
         public Notification(string title, string message, Severity severity, bool isAcknowledgable) : this(title, message, severity)
         {
             IsAcknowledgable = isAcknowledgable;
         }
+
+        #region IManagedNotification
+        /// <inheritdoc />
+        Guid IManagedNotification.Identifier
+        {
+            get => Identifier;
+            set => Identifier = value;
+        }
+
+        DateTime? IManagedNotification.Acknowledged
+        {
+            get => _acknowledged;
+            set => _acknowledged = value;
+        }
+
+        string IManagedNotification.Acknowledger
+        {
+            get => Acknowledger;
+            set => Acknowledger = value;
+        }
+
+        DateTime IManagedNotification.Created
+        {
+            get => Created;
+            set => Created = value;
+        }
+
+        /// <inheritdoc />
+        string IManagedNotification.Sender { get; set; }
+
+        /// <inheritdoc />
+        string IManagedNotification.Source { get; set; }
+        #endregion
     }
 }