E14 - How to List all Users Who Have Access to Other Exchange Mailboxes

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http://exchangeserverpro.com/list-users-access-exchange-mailboxes/ 

[PS] C:\Windows\system32>get-mailbox -OrganizationalUnit System_Accounts | Get-MailboxPermission | Where {$_.user.tostring() -ne "NT AUTHORITY\SELF" -and $_.IsInherited -eq $false} | Select Identity,User,@{Name='Access Rights';Expression={[string]::join(', ', $_.AccessRights)}} | Export-Csv -NoTypeInformation c:\mailboxpermissions.csv

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