It looks like it is supported, but I cant confirm.It seems that "single inbox" is supported in 8.5 and after.. and I assume it is supported with CUCMBE... but you know how the docs can be misinterupted with Unified Messaging as IMAP, etc. 5000/6000 support Exchange UM?
• Version 8.5 of Cisco Unity Connection delivers single-inbox unified messaging with Microsoft Exchange. Voice messages are delivered to the same folder as email messages in Outlook, delivering true unified messaging and overcoming concerns from some customers about the separate folder experience with integrated messaging.
Here's another example of how they just point to the UC documentation within the CUCMBE 8.6 RNE:
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.