Comment 18 for bug 156288

The behavior described by Peter exists in KDE 4.3, but it's not ideal. Better would be one of the following:
1. Create a copy by value of the e-mail message in KOrganizer
2. Create a kmail interface to refer to messages by reference, and store in korganizer a reference to the original message.

#2 is way more complex, especially if the message is moved to a new folder and still has to be found via the old reference.