Sametime 8.5 – Experience and a essential question

I already wrote about Sametime 8.5 two month ago and got many responses which comfirmed my experiences and which IBM  probably does not want to hear.

During the last days, I deleved into the whole Sametime 8.5 issue including the Websphere based services like Sametime System Console, Sametime Proxy, Sametime Meeting Server and Sametime Media Manager. While studying the documentation and installing the whole environment a basic question came up and has not been answered sufficiently – how to roll out Sametime 8.5 with less interruption as possible?