With a unified messaging solution or voicemail only solution that uses Exchange as the information store, the voice messages do not stay on the Unity voice server. If Exchange is operational, the message is moved to the information store. Essentially, the subscriber's phone plays the voice message streamed from the Exchange server. Without the ViewMail client loaded on the workstation, the incoming voice message appears as an email with a wav attachment. If you want to separate voice messages from email using your current unified messaging deployment, you could create a "vm-xxxxxx" user account and import that into Unity for each user. Disable text-to-speech feature in the class of service for these users. You can optionally disable the Unity Assistant or Unity Inbox, so that even PC access is eliminated. The users only access voicemail from their phone, not Outlook. Cisco does offer Unity Connection, a voicemail only server which does not require AD or Exchange. Voice messages are housed on the voice server. I am not sure of its scalability for your user requirements, I think 1500 users, but would recommend you contact your Cisco account rep. Here is a link describing - http://www.cisco.com/en/US/customer/products/ps6509/index.html
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.