Is the any problem to use FIM to synchronize GAL with 2 forest with 2 exchange organization with a share SMTP Domain?? We need to this, for coexistente during the migration from Exchange 2003 to Exchange 2010? (Resource Forest)

If I'm correct this is no problem at all. I think it's a common requirement to use the same SMTP domain in such a coexistance situation. In fact we're doing it too right now using FIM 2010. Suppose the customer uses customer.com as it's main SMTP domain. You'll have to pick additional namespaces just for mail-routing purposes. User will not actually see these. So you could have doma.customer.com and domb.customer.com. One for each Exchange organization. A mailbox in Domain A would have a targetaddress of doma.customer.com (and still a primary of customer.com). Whilst the contact (GAL Sync) for this mailbox in Domain B would also have a targetAddress of doma.customer.com. This way mail routing should know in "which" Exchange organization to deliver it's mail. The above process might not be 100% accurate. But I'm pretty sure it covers most of it. Good Luck, Thomashttp://setspn.blogspot.com