diff --git a/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs
index 3f964c67..2a2ecf85 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs
@@ -7,6 +7,7 @@
 //----------------------------------------------------------------------
 namespace CampusAppWP8.Feed.Departments
 {
+    using System;
     using System.IO;
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Departments;
@@ -59,7 +60,7 @@ namespace CampusAppWP8.Feed.Departments
             }
             else
             {
-                retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, model.CreateTime, 7.0);
+                retValue = this.CheckIsUpToDate(model.CreateTime);
             }
             
             return retValue;
@@ -80,7 +81,7 @@ namespace CampusAppWP8.Feed.Departments
                 // at loading
                 if (info.Exists == true)
                 {
-                    retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, info.LastWriteTime, 7.0);
+                    retValue = this.CheckIsUpToDate(info.LastWriteTime);
                 }
             }
             
@@ -103,10 +104,24 @@ namespace CampusAppWP8.Feed.Departments
             {
                 retValue = false;
             }
-        
+
+            if (model != null && model.HasChanged())
+            {
+                retValue = false;
+            }
+
             return retValue;
         }
 
+        /// <summary>Check if the model or file is up-to-date.</summary>
+        /// <remarks>Stubbfel, 12.09.2013.</remarks>
+        /// <param name="lastModified">Date of the last modification.</param>
+        /// <returns>true, if is up-to-date, otherwise false.</returns>
+        private bool CheckIsUpToDate(DateTime lastModified)
+        {
+            return Utilities.DayDifference(Utilities.DifferenceType.Less, lastModified, 30);
+        }
+
         // Protedted
         #endregion
 
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs
index 60216204..bf11138f 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs
@@ -7,6 +7,7 @@
 //----------------------------------------------------------------------
 namespace CampusAppWP8.Feed.Events
 {
+    using System;
     using System.IO;
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.RSS;
@@ -50,7 +51,7 @@ namespace CampusAppWP8.Feed.Events
             }
             else
             {
-                retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, model.CreateTime, 1.0);
+                retValue = this.CheckIsUpToDate(model.CreateTime);
             }
 
             return retValue;
@@ -71,7 +72,7 @@ namespace CampusAppWP8.Feed.Events
                 // at loading
                 if (info.Exists == true)
                 {
-                    retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, info.LastWriteTime, 1.0);
+                    retValue = this.CheckIsUpToDate(info.LastWriteTime);
                 }
             }
             
@@ -93,8 +94,22 @@ namespace CampusAppWP8.Feed.Events
             {
                 retValue = false;
             }
+
+            if (model != null)
+            {
+                retValue = this.CheckIsUpToDate(info.LastWriteTime);
+            }
         
             return retValue;
         }
+
+        /// <summary>Check if the model or file is up-to-date.</summary>
+        /// <remarks>Stubbfel, 12.09.2013.</remarks>
+        /// <param name="lastModified">Date of the last modification.</param>
+        /// <returns>true, if is up-to-date, otherwise false.</returns>
+        private bool CheckIsUpToDate(DateTime lastModified)
+        {
+            return Utilities.DayDifference(Utilities.DifferenceType.Less, lastModified, 1.0);
+        }
     }
 }
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs
index c2dc6ccb..ac85174d 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs
@@ -11,6 +11,7 @@ namespace CampusAppWP8.Feed.Exams
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Exams;
     using CampusAppWP8.Resources;
+    using CampusAppWP8.Utility;
 
      /// <summary>Exam feed.</summary>
      /// <remarks>Stubbfel, 02.09.2013.</remarks>
@@ -53,6 +54,11 @@ namespace CampusAppWP8.Feed.Exams
                  return false;
              }
 
+             if (model != null)
+             {
+                 return Utilities.DayDifference(Utilities.DifferenceType.Less, fileInfo.LastWriteTime, 30.0);
+             }
+
              return true;
          }
     }
diff --git a/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs
index 2fec1634..44a83a77 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs
@@ -7,6 +7,7 @@
 //-----------------------------------------------------------------------------
 namespace CampusAppWP8.Feed.News
 {
+    using System;
     using System.IO;
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.RSS;
@@ -50,7 +51,7 @@ namespace CampusAppWP8.Feed.News
             }
             else
             {
-                retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, model.CreateTime, 1.0);
+                retValue = this.CheckIsUpToDate(model.CreateTime);
             }
 
             return retValue;
@@ -70,7 +71,7 @@ namespace CampusAppWP8.Feed.News
             {
                 if (info.Exists == true)
                 {
-                    retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, info.LastWriteTime, 1.0);
+                    retValue = this.CheckIsUpToDate(info.LastWriteTime);
                 }
             }
             
@@ -92,8 +93,22 @@ namespace CampusAppWP8.Feed.News
             {
                 retValue = false;
             }
-        
+
+            if (model != null)
+            {
+                retValue = this.CheckIsUpToDate(info.LastWriteTime);
+            }
+
             return retValue;
         }
+
+        /// <summary>Check if the model or file is up-to-date.</summary>
+        /// <remarks>Stubbfel, 12.09.2013.</remarks>
+        /// <param name="lastModified">Date of the last modification.</param>
+        /// <returns>true, if is up-to-date, otherwise false.</returns>
+        private bool CheckIsUpToDate(DateTime lastModified)
+        {
+            return Utilities.DayDifference(Utilities.DifferenceType.Less, lastModified, 1.0);
+        }
     }
 }
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs
index cf60760a..7858f67a 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs
@@ -7,6 +7,7 @@
 //----------------------------------------------------------------------
 namespace CampusAppWP8.Feed.Openinghours
 {
+    using System;
     using System.IO;
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Openinghours;
@@ -52,7 +53,7 @@ namespace CampusAppWP8.Feed.Openinghours
             }
             else
             {
-                retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, model.CreateTime, 7.0);
+                retValue = this.CheckIsUpToDate(model.CreateTime);
             }
 
             return retValue;
@@ -72,7 +73,7 @@ namespace CampusAppWP8.Feed.Openinghours
             {
                 if (info.Exists == true)
                 {
-                    retValue = Utilities.DayDifference(Utilities.DifferenceType.Less, info.LastWriteTime, 7.0);
+                    retValue = this.CheckIsUpToDate(info.LastWriteTime);
                 }
             }
 
@@ -95,9 +96,23 @@ namespace CampusAppWP8.Feed.Openinghours
                 retValue = false;
             }
 
+            if (model != null)
+            {
+                retValue = this.CheckIsUpToDate(info.LastWriteTime);
+            }
+
             return retValue;
         }
 
+        /// <summary>Check if the model or file is up-to-date.</summary>
+        /// <remarks>Stubbfel, 12.09.2013.</remarks>
+        /// <param name="lastModified">Date of the last modification.</param>
+        /// <returns>true, if is up-to-date, otherwise false.</returns>
+        private bool CheckIsUpToDate(DateTime lastModified)
+        {
+            return Utilities.DayDifference(Utilities.DifferenceType.Less, lastModified, 7.0);
+        }
+
         #endregion
 
         #endregion
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Utility/CourseFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Utility/CourseFeed.cs
index 70d9103b..7c0c0b30 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Utility/CourseFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Utility/CourseFeed.cs
@@ -11,49 +11,11 @@ namespace CampusAppWP8.Feed.Utility
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Exams;
     using CampusAppWP8.Resources;
+    using CampusAppWP8.Feed.Exams;
 
     /// <summary>Course Feed.</summary>
     /// <remarks>Stubbfel, 02.09.2013.</remarks>
-    public class CourseFeed : XmlModel<ExamListModel>
+    public class CourseFeed : ExamFeed
     {
-        /// <summary>Initializes a new instance of the CourseFeed class.</summary>
-        /// <remarks>Stubbfel, 02.09.2013.</remarks>
-        public CourseFeed()
-            : base(ModelType.FileAndFeed, Constants.FileExamApp_ExamFeed, Constants.UrlExamApp_ExamFeed)
-        {
-            this.IsFileUpToDateOnLoad += new IsFileUpToDate(this.CheckIsFileUpToDate);
-            this.IsModelUpToDateOnLoad += new IsModelUpToDate(this.CheckIsModelUpToDate);
-            this.IsFileUpToDateOnSave += new IsFileUpToDate(this.CheckIsFileUpToDate);
-            this.ValidRootName = Constants.ExamXmlValidRootName;
-        }
-
-        /// <summary>Check is model up to date.</summary>
-        /// <remarks>Stubbfel, 02.09.2013.</remarks>
-        /// <param name="model">The model.</param>
-        /// <returns>true if it succeeds, false if it fails.</returns>
-        private bool CheckIsModelUpToDate(ExamListModel model)
-        {
-            if (model == null)
-            {
-                return false;
-            }
-
-            return true;
-        }
-
-        /// <summary>Check is file up to date.</summary>
-        /// <remarks>Stubbfel, 02.09.2013.</remarks>
-        /// <param name="model">   The model.</param>
-        /// <param name="fileInfo">Information describing the file.</param>
-        /// <returns>true if it succeeds, false if it fails.</returns>
-        private bool CheckIsFileUpToDate(ExamListModel model, FileInfo fileInfo)
-        {
-            if (fileInfo == null || !fileInfo.Exists || fileInfo.Length < 1)
-            {
-                return false;
-            }
-
-            return true;
-        }
     }
 }