ive used hylafax mostly for sending. We used w2hfax as a windows client, it did require some modification just to make it run though. I don't believe anyone currently maintains that client. I configured redmon and a print to pdf server thingy. WIndows clients would "print" what they wanted to send, w2hfax would pickup that "print job" and bring up a dialog box for a fax number. It does work well once you get it configured and requires little monitoring.