Hope this is the correct forum for this topic. If not, I am sorry, please point to the right discussion group. My company has both Exchange and Groupwise in its environment and we need to provide a method to allow sharing of address book and calendar to all users. My understanding is that the Coexistence Solution provides that bridging. I would appreciate real life (not marketing spin) opinions as to how well the solution works, how involved the setup is, additional management effort, etc. Is it compatible Exchage 2010?