email2 provides security, archiving, attachment management, video messaging, message tracking - and so on. Just because you already have an archival system doesn't mean you can't still enjoy everything else that email2 has to offer.
And besides, using email2's archival system won't interfere with your existing archival system. Once email2 Messages are downloaded from the Private Email Network, they behave exactly as basic email messages - which means they can be archived or handled however you'd like. In the case that your original archival system fails, the secure, archived email2 Messages will still be around to save the day.
// Edited July 2008