Hi, I have a customer who considers to move one of there Exchange sites to Office365. Today they have 2 sites, the main site that runs Exchange 2010 with and casArray configured. In the other site, also an own ad site, runs Exchange 2003. Here we want to create another E2010 Casarray for the users and run a hybrid configuration with Office 365 to which we will migrate the users for this site. Can this be done at all? UC