Find mailboxes in Exchange 2010/2013 with enabled mail forwarding

How to find all mailboxes in Exchange 2010/2013 with mail forwarding enabled?

It's just a string in Powersehll:

Get-Mailbox | ?{$_.ForwardingAddress -ne $null -or $_.ForwardingSmtpAddress -ne $null} | select name,userprincipalname,*forw*

You can customize the output parameters by yourself.