Setting up forwarding of emails is easy enough, via the 'set-mailbox -ForwardingAddress...' command. But there appears to be no method of then disabling forwarding for that mailbox via the Exchange Management Shell. Of course, the Exchange Management Console can always be used, but I'm programming a new administration console so I need a programmatic option. I supposes I could fall back to updating Active Directory attributes, but now that would be cheating, wouldn't it? Anyone have a solution for doing this via the shell?

is this what you want Set-Mailbox... -ForwardingAddressNull