We recently acquired a company which uses Microsoft Exchange 2000 as it's email platform. Our existing infrastructure still runs on Lotus Domino 8. We are currently looking into integrating the address books from both into one. We want to keep a flat 1 domain name structure for all users in both domino and exchange, so all emails will come in to a domino server, then get bounced over to an exchange server if this user is an exchange user. I'm wondering if anyone has encountered this type of situation before, and how they handled the configuration.