This Power Shell cmdlet will show all of the mailbox sizes and their quotas.  It will also let you know if the mailbox has exceeded it’s quota and disabled as a result.  It outputs the username, the total item size (sorted highest to lowest), and their storage limit status.
Get-MailboxStatistics -Server SERVERNAME | Sort-Object -Property TotalItemSize [...]

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If you migrated from Exchange 2003 to Exchange 2007 and still have some residual mailboxes left behind on the old exchange 2003 server, this Power Shell cmdlet will be very useful to you.  It will list all users the old exchange 2003 server and their respective mailstores.
Get-Mailbox -OrganizationalUnit OUNAME -Server OLDSERVER | Format-List Alias, ServerLegacyDN
Where [...]

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