Dave Goldman, who has been working on and is coordinating a lot of the E2010 Address List Segregation documentation effort - has just posted an update on his blog that can give you an idea where things stand right now and what to expect in the future as far as transitioning between versions of Exchange if you use this functionality. If address list segregation is something you need for Exchange 2010 or you are using it today - definitely go ahead and read this!
Direct link: http://blogs.msdn.com/dgoldman/archive/2010/05/10/critical-update-exchange-2010-address-list-segrega...
- Nino Bilic
