There's an Uninstall tool on my AnswerMonkey web page.
If the system is in working order (i.e. Unity comes up) uninstalling is as simple as removing Dialogic (if you're using it), running this tool and rebooting.
If the system is currently not flying (i.e. Unity does not come up) you have to work a little harder for it since removing subscriber properties from standing mail users in Exchange then gets a whole lot more difficult.
Read the help file for the tool, it covers the basic scenarios for this.
Jeff Lindborg
Unity Product Architect/Answer Monkey
Cisco Systems
lindborg@cisco.com
http://www.AnswerMonkey.net (new page for Unity support tools and scripts)