Microsoft Exchange 2003 - Alternative Forest Recovery
Introduction to Exchange 2003 Alternative Forest Recovery
Avoid the Alternative Forest method if at all possible. Seek an easier solution to recovering the email, for example Mailbox Recovery Center. Re-creating your Active Directory forest in a separate subnet is a huge undertaking. However, one recommended use of this technique is where you practicing a restore on a standby server.
Topics for Exchange Alternative Forest Recovery
An employee left your company last year, not only did you delete their mailbox, but you also deleted their Active Directory user account. The boss tells you the name of the user and tells you to restore their mailbox. Exchange 2003's Alternative Forest Recovery would be one option, however if it were me, I would ask if there was an alternative, for example just creating a brand new mailbox enabled user.
One clue that you should avoid this Alternative Forest method, is that previously, this was the only way to recover old mailboxes. In Exchange 2003 server, Microsoft has introduced two if not three new strategies for mailbox recovery, so try them first. For example, if the mailbox was deleted less than a month ago, then try the Mailbox Recovery Center. If it's over 30 days since you deleted the mailbox but the account still exists, then try the Recovery Storage Group method. Even if the original mailbox is now attached to a different user, you may be able to avoid grappling with the Alternative Forest Recovery method.
Here is a free tool to monitor your Exchange Server. Download and install the utility, then inspect your mail queues, monitor the Exchange server's memory, confirm there is enough disk space and check the CPU utilization.
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Import users from a spreadsheet, complete with their mailbox. Just provide a list of the users with the fields in the top row, and save as .csv file. Then launch this FREE utility, match your Exchange fields with AD's attributes, click and import the users. Optionally, you can provide the name of the OU where the new mailboxes will be born.
The Alternative Forest Recovery method would be my last choice for recovering a mailbox. However, if the original mailbox was deleted more than a month ago, the user account does not exist in Active Directory, and this is a really important mailbox, then I would reluctantly resort Alternative Forest Recovery.