Recovery Storage Groups
In Exchange 2000, the only way to restore Exchange mailbox data without adversely affecting your production environment is to use a recovery forest and a recovery server. A recovery forest is a second Active Directory forest with the same name as your production forest that includes an Exchange organization with the same name as your production organization. A recovery server is a second Exchange 2000 server in the recovery forest that has the same name as the production server whose data is being restored. An alternate forest and organization are needed because you cannot have more than one database in the same Exchange organization that contains a mailbox for the same user. It just doesn't work; Outlook, for example, ...
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