I used to use this software a good bit when I had WinME. The only real problem I had was with the answering machine. NO matter what I did, the recorded voice (mine, not the pre-recorded included) sounded as if it was speaking at half-speed.
I've now upgraded to WinXP and I can't get it to work. It installs fine, recognizes and initiates my modem, but it won't send out a fax, nor will it let me make any settings changes. It acts as if there is no phone line connected.
Also, good luck finding any support whatsoever. The original maker Communique, doesn't even list this product on their website.
Stay far, far away!