It may be possible to recover this data. Do you have a backup of your mailbox store that was taken prior to deleting the user's mailbox? If so, you can restore that to a recovery server, then use ExMerge to export the contents of the recovered mailbox to a PST file, which then can be opened and imported in Outlook to move the items back into the person's new mailbox.
Dig Deeper on Microsoft Exchange Server Backup and Disaster Recovery
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