Exchange 2007 Mailbox Cleanup - Exporting Mailboxes Script

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http://serverfault.com – I have been assigned a task to cleanup our Exchange server by exporting the mailboxes of users who have left the company. We want to keep a copy of the mailbox for 90 days, just in case HR or management needs it later. I have over 130+ mailboxes to export to complete this task. I see that the only way to export a mailbox to a PST is to use Export-Mailbox cmdlet via the Exchange Management Tools. My question is this: Is there a script where I can do this en mass?? Perhaps past the email adresses into a file and run the script? This would be helpful and cut down the time it would take to comple ()