Script Download:OSCGetOldMailbox(PowerShell).zip
http://gallery.technet.microsoft.com/scriptcenter/Get-the-mailbox-created-14d6d3bc/

This PowerShell script sample can get the mailbox created before the given date for Exchange 2010.

IT Administrators may care about the creation date of mailbox.  This script is good for admins to check the mailbox creation date.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery