the life of a System Administrator

One thing is certain when you assign space to mailboxes. If the user is assigned 100MB she will use it, if the user is assigned 1000MB, she will use it. Unlike in Exchange Server 2003 you are not able to retrieve a list that displays the mailbox size from the Exchange Server 2007 management console. The script below displays the 50 largest mailboxes in your organization in descending order. Simply edit the script to reflect your needs.

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Add-PSSnapin -name Microsoft.Exchange.Management.Powershell.Admin
 
Get-MailboxStatistics -Server "server"  | Sort-Object -Descending TotalItemSize | ft displayname,totalitemsize,ItemCount,StorageLimitStatus | Select-Object -first 50