There’s a lot of confusion regarding the compatibility of Microsoft Vista or Microsoft Windows 7 and WinFax PRO. Part of the confusion is that you can install WinFax on a Windows 7 or Vista installation, and you can send a cover page. See the following links regarding the full details on WinFax compatibility with Microsoft Vista or Windows 7.
Information regarding use of WinFax with Microsoft Vista and Microsoft Windows 7 from the WinFax Forums: http://www.getfaxing.com/forums/viewtopic.php?f=17&t=718
Technical article on Microsoft Vista and WinFax PRO: http://www.getfaxing.com/winfax/2008/11/29/winfax-pro-and-microsoft-vista-compatibility/
Technical article on Microsoft Windows 7 and WinFax PRO: http://www.getfaxing.com/winfax/2009/06/03/symantec-winfax-pro-and-microsoft-windows-7-compatibility/
Alternative to WinFax PRO is FaxTalk FaxCenter Pro, it is compatible with Windows 7 & VISTA. More details here: http://www.getfaxing.com/faxtalk