Getting a report with hidden users

Hi Guys,

Exchange 2010

I am trying to find all users that are hidden in exchange and that are forwarding emails to others. 

Or if you have something better to find disabled users forwarding email will help as well.

so far this is what I have:

$outputfile =  "C:\scripts\usersreport.txt"

Get-Mailbox -ResultSize unlimited |Where{$_.HiddenFromAddressListsEnabled -eq $true}  > $outputfile

Let me know how can I add the email forwarding portion

thanks