From ActFax Communication Software:
ActiveFax Server (64-bit) allows a fast and simple integration of fax and email with Windows as well as other operating systems, like UNIX, Linux, DOS or mainframes. The software also offers full support for terminal server environments. It allows efficient usage of the software for small installations with just a few workstations and a single fax line, as well as large installations with thousands of users and more than 60 simultaneous fax lines. In addition to sending and receiving fax messages from any standard application, ActFax can also be used for easy integration into own applications, for example to fax fully automated purchase orders or order confirmations.