Hi, We have installed Exchange 2010 Sp1 in hosted model (.i.e by using /hosting switch). We have 2 GC Servers, 3 Mailbox in DAG, 2 servers with Hub and CAS clubbed in both the servers. We have created mailbox plans and service plan for tenant organizations and created Organizations with SMTP domain name. Creation of tenant organization in Exchange 2010 SP1 Hosted itself creates its own OU and DL in AD. Also it creates its own GAL, Address list, Accepted Domain, Email Address Policy and requested rights to view its own GAL. We created users in tenant organization and tried to configure POP3, IMAP, OWA. Everything works fine with tenant organization. EWS service also works fine as we can access the free/busy information for tenant users. Also when we log on to OWA we are able to see the right GAL of tenant organization, how it suppose to be. But the issue raises when we try to access Outlook anywhere. When we try to access the outlook anywhere from a client machine in the same domain, it works for the user in the base Exchange setup. But the same is not working for any of the users in the tenant organization. When we try to do the autodiscover for the tenant organizations, we get the error "The name cannot be matched to a name in the address list". Autodiscover is setup fine and no issues with autodiscover configuration. We doubt the problem is with respect to the Address list segregation done automatically by Exchange 2010 SP1 for tenant organization.