Faxes seem to be in use at places where there is an established system/bureaucracy. We use them regularly in aviation because our suppliers/customers/service providers require them for some reason. Medical offices use them to adhere to HIPAA requirements. The government and large corporations use them because it was how the system was developed at some point and they haven't gotten around to changing it yet. (UPS, for example, can't resend us certain invoices via e-mail, only fax. I have no clue why.)