@OpenWombat if you need help resolving the situation just let us know. ^FB
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A stub is a pointer left in the primairy ZCP server that points to the actual message inside the Zarafa Archiver server. When selected the message in the primairy ZCP store is "de-stubbed", which presents the user with the content that has been retrieved internally form the Zarafa Archiver server. All this without the user having to do anything special.