Turns out the permission's wizard failed to assign the proper rights to unityinstall. Once I assigned it to a security group which had permissions over the exchange server mailstore, the MSCW ran just fine.
Hey, not sure if I can help you with your problem, but where did you get your wizard? We were asked to re-run the wizard from a TAC engineer, but he is off now, and he didn't supply us with the wizard. Thanks
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.