I've installed a couple of dozen integrations between Unity and Exchange. Unity uses an email system (whether it's Exchange or Domino) as a message store. You cannot have a Unity subscriber without a mailbox. If Exchange is down, Unity places messages into the local filesystem until Exchange comes back up. Now, the various permutations get a little weird, depending on whether you are doing Unified Messaging or Voice-Mail Only. However, while there is a compatibility matrix, there is no inherent requirement that both pieces of software be upgraded at the same time. ________________________________ From: Robert Lawson [mailto:rlawson@xxxxxxxx] Sent: Wednesday, May 25, 2005 10:37 AM To: [ExchangeList] Subject: Soka|Exchange & Cisco's Unity voicemail Hello All, We are looking for folks who have interfaced Cisco's Unity voice mail with Exchange. Is there a "lite" interface between these two products, so both products can be upgraded independently, yet voice-mail messages can still be delivered to Exchange mail boxes. Also is there a way to selectively turn-off/on the interface by individual user? Our shop: Windows Server 2003; Exchange 2003 Enterprise; Unity 4.0 Thanks, Robert Robert Lawson Database Administrator/email Administrator Soka University of America 1 University Drive Aliso Viejo, CA. 92656 main: 949.480.4000 fax: 949.480.4001 direct: 949.480.4224 rlawson@xxxxxxxx <mailto:rlawson@xxxxxxxx>