The document with the certification tables of EV indicates that certification of Entourage 2004 is pending (see http://ftp.support.veritas.com/pub/support/products/Exchange_Mailbox_Archiving_Unit/276547.pdf) .
My first question: When is certification expected? Second: What funktionality is provided by Entourage?
This is still pending. The supportabilty means that you will be able to retrieve items as opposed to using the Universal Shortcuts to access vaulted items from the entourage client.