$DBList = Get-MailboxDatabase
foreach($db in $DBList)
{
	Get-Mailboxstatistics -Database $db.name `
	| Where-Object{$_.DisconnectReason -ne $Null} `
	| ft DisplayName, Database, DisconnectDate, DisconnectReason
}

Quelle: Link

Get-eshMailboxDatabase | %{Get-eshMailboxStatistics -Database $_.Name | Where{ $_.DisconnectDate -ne $null } |ft DisplayName, Database, Identity, DisconnectReason -AutoSize}