diff --git a/src/akonadi/akonadimessaging.h b/src/akonadi/akonadimessaging.h
--- a/src/akonadi/akonadimessaging.h
+++ b/src/akonadi/akonadimessaging.h
@@ -37,6 +37,8 @@
     ~Messaging();
 
     void sendDelegationMessage(Akonadi::Item item) Q_DECL_OVERRIDE;
+    void sendDeleteMessageToOrganisator(Akonadi::Item item) Q_DECL_OVERRIDE;
+    void sendDeleteMessageToDelegatee(Akonadi::Item item) Q_DECL_OVERRIDE;
 
 private:
     ITIPHandler *m_itip;
diff --git a/src/akonadi/akonadimessaging.cpp b/src/akonadi/akonadimessaging.cpp
--- a/src/akonadi/akonadimessaging.cpp
+++ b/src/akonadi/akonadimessaging.cpp
@@ -53,3 +53,29 @@
 
     m_itip->sendiTIPMessage(KCalCore::iTIPRequest, todo, window);
 }
+
+void Messaging::sendDeleteMessageToOrganisator(Akonadi::Item item)
+{
+    auto todo = item.payload<KCalCore::Todo::Ptr>();
+    Q_ASSERT(todo);
+
+    QWidget *window = 0;
+    if (!QApplication::topLevelWidgets().isEmpty()) {
+        window = QApplication::topLevelWidgets().first();
+    }
+    todo->attendees().first()->setStatus(KCalCore::Attendee::Declined);
+    m_itip->sendiTIPMessage(KCalCore::iTIPReply, todo, window);
+}
+
+void Messaging::sendDeleteMessageToDelegatee(Akonadi::Item item)
+{
+    auto todo = item.payload<KCalCore::Todo::Ptr>();
+    Q_ASSERT(todo);
+
+    QWidget *window = 0;
+    if (!QApplication::topLevelWidgets().isEmpty()) {
+        window = QApplication::topLevelWidgets().first();
+    }
+
+    m_itip->sendiTIPMessage(KCalCore::iTIPCancel, todo, window);
+}
\ No newline at end of file
diff --git a/src/akonadi/akonadimessaginginterface.h b/src/akonadi/akonadimessaginginterface.h
--- a/src/akonadi/akonadimessaginginterface.h
+++ b/src/akonadi/akonadimessaginginterface.h
@@ -35,6 +35,8 @@
     virtual ~MessagingInterface();
 
     virtual void sendDelegationMessage(Akonadi::Item item) = 0;
+    virtual void sendDeleteMessageToOrganisator(Akonadi::Item item) = 0;
+    virtual void sendDeleteMessageToDelegatee(Akonadi::Item item) = 0;
 };
 
 }
diff --git a/src/akonadi/akonadiserializer.cpp b/src/akonadi/akonadiserializer.cpp
--- a/src/akonadi/akonadiserializer.cpp
+++ b/src/akonadi/akonadiserializer.cpp
@@ -512,6 +512,11 @@
             task->setDelegate(Domain::Task::Delegate((*delegate)->name(), (*delegate)->email()));
         }
     }
+
+    if(todo->organizer()) {
+        task->setProperty("organizer", todo->organizer()->fullName());
+    }
+
     if (!todo->alarms().isEmpty()) {
         task->setAlarms(fromKCalAlarm(todo->alarms()));
     } else {
diff --git a/src/akonadi/akonaditaskrepository.cpp b/src/akonadi/akonaditaskrepository.cpp
--- a/src/akonadi/akonaditaskrepository.cpp
+++ b/src/akonadi/akonaditaskrepository.cpp
@@ -219,9 +219,19 @@
 
 KJob *TaskRepository::remove(Domain::Task::Ptr task)
 {
+    auto delegate = task->delegate();
     auto item = m_serializer->createItemFromTask(task);
     Q_ASSERT(item.isValid());
 
+    if (delegate.isValid()) {
+        KPIMIdentities::IdentityManager identityManager;
+        if (identityManager.thatIsMe(delegate.email())) {
+            m_messaging->sendDeleteMessageToOrganisator(item);
+        } else {
+            m_messaging->sendDeleteMessageToDelegatee(item);
+        }
+    }
+
     auto compositeJob = new CompositeJob();
     ItemFetchJobInterface *fetchItemJob = m_storage->fetchItem(item);
     compositeJob->install(fetchItemJob->kjob(), [fetchItemJob, compositeJob, this] {
@@ -329,9 +339,11 @@
 
     task->blockSignals(true);
     task->setDelegate(delegate);
-    KPIMIdentities::IdentityManager identityManager;
-    task->setProperty("organizer", identityManager.defaultIdentity().fullEmailAddr());
 
+    if (task->property("organizer").toString().isEmpty()) {
+        KPIMIdentities::IdentityManager identityManager;
+        task->setProperty("organizer", identityManager.defaultIdentity().fullEmailAddr());
+    }
     auto item = m_serializer->createItemFromTask(task);
 
     task->setDelegate(originalDelegate);