Can I add additonal account forests to use a exchange resource forest. Also could I change mailboxes on a exchange forest to be authenticated to a different accounts forest by relinking them. For example if we migrated users form one donain to another could the users be relinked to their mailboxes on the exchange forest after changing domain membership?

Yes. But you should seriously consider whether you really need multiple domains. You can actually have better security through delegated organizational units than you can have through multiple domains. -- Ed Crowley MVP "There are seldom good technological solutions to behavioral problems." . "2010" wrote in message news:6fb81e6b-6e94-48a5-8c93-d9472cae51ec... Can I add additonal account forests to use a exchange resource forest. Also could I change mailboxes on a exchange forest to be authenticated to a different accounts forest by relinking them. For example if we migrated users form one donain to another could the users be relinked to their mailboxes on the exchange forest after changing domain membership?Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi 2010, As ED refered, you could do that, it seems the resource forest for the account forest scenario. The exchange resource forest would supply linked mailbox for the account forest, for the legacy mailbox, you could convert it to a linked mailbox and link it to the account in the account forest. Some information for you: http://technet.microsoft.com/en-us/library/bb201694.aspx Regards! Gavin