#get a list of all disconnected mailboxes and which database 
#they are in by using the DataDiscoveredAbsentInDS property:
#

Get-Wmiobject -namespace root\MicrosoftExchangeV2 -class Exchange_Mailbox -computer $computer | where { $_.DateDiscoveredAbsentInDS -like '2*' } | sort-object MailboxDisplayName | select-object MailboxDisplayName,Servername,StorageGroupName,StoreName,Size,DateDiscoveredAbsentInDS)

