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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If you need to modify or update your Microsoft Exchange 2007 product key, use the following cmdlet:
set-exchangeserver -Identity ‘SERVERNAME’ -ProductKey ‘XXXXX-XXXXX-XXXXX-XXXXX-XXXXX’
This is a useful command if you upgrade from Exchange 2007 Standard to Exchange 2007 Enterprise.

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Use this CMDLET to dispay the mailbox/user size usage for each of your users on your Exchange 2007 server in an easy to read formatted list.
Get-MailboxStatistics -Server SERVERNAME | Sort-Object -Property TotalItemSize | Format-Table DisplayName,TotalItemSize
You can go one step further and display the list in decending format which will place the people using the most [...]

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Use this cmdlets to list all users on old server and their old mailstore
Replace “OUNAME” with one of your Organization Units
Replace “SERVERNAME” with your exchange 2003 server
Get-Mailbox -OrganizationalUnit OUNAME -Server SERVERNAME | Format-List Alias, ServerLegacyDN

Continue reading " List All Mailboxes and Aliases on Old Exchange 2003 Server "