Get-Mailbox -ResultSize Unlimited | Get-MailboxFolderStatistics -FolderScope 'SentItems' | Sort-Object FolderSize -Descending | Select-Object -First 100 Identity, FolderPath, ItemsInFolder, FolderSize
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http://myitforum.com/cs2/blogs/yli628/archive/2008/05/06/powershell-script-to-list-the-top-10-mailbox-user-on-your-exchange-2007-server.aspx
- Rancy