diff --git a/callback.cpp b/callback.cpp
index 7fa24875c..5bc0d5e2a 100644
--- a/callback.cpp
+++ b/callback.cpp
@@ -65,6 +65,16 @@ bool Callback::mailICal( const QString& to, const QString &iCal,
   KMMessage *msg = new KMMessage;
   msg->initHeader();
   msg->setSubject( subject );
+  if ( GlobalSettings::self()->exchangeCompatibleInvitations() ) {
+    if ( status == QString("cancel") )
+      msg->setSubject( QString("Declined: %1").arg(subject).replace("Answer: ","") );
+    else if ( status == QString("tentative") )
+      msg->setSubject(QString("Tentative: %1").arg(subject).replace("Answer: ","") );
+    else if ( status == QString("accepted") )
+      msg->setSubject( QString("Accepted: %1").arg(subject).replace("Answer: ","") );
+    else if ( status == QString("delegated") )
+      msg->setSubject( QString("Delegated: %1").arg(subject).replace("Answer: ","") );
+  }
   msg->setTo( to );
   msg->setFrom( receiver() );
 
diff --git a/callback.h b/callback.h
index 29fba7acf..716b436dd 100644
--- a/callback.h
+++ b/callback.h
@@ -60,7 +60,7 @@ public:
   KMMessage* getMsg() const { return mMsg; }
 
   /** Mail a message
-   * @ param status can be accepted/declined/tentative
+   * @ param status can be accepted/cancel/tentative/delegated
    */
   bool mailICal( const QString &to, const QString &iCal,
                  const QString &subject, const QString &status,