Hey folks, I know it has been some time since I have last posted anything on this topic and you are all waiting patiently. I want you all to know that this is something that I take great pride in doing and keeping everyone informed. With that being said, at this time all I can say is that I am working with the Exchange Product Group teams around the supportability, upgrad path, co / product existance with regards to Address List Segregation.
Please rest assure that there will be a public announcement in the next few weeks here on my blog site detailing all of our work around Address List Segregation for Exchange 2010, and the direction we will be taking.
I also want to be clear that installing Exchange 2010 SP1 will not help you with address list segregation and it is still not supported. You still have to wait until the official statement is released.