As of June 30, 2006, the Microsoft FrontPage 2002 Server Extensions for UNIX/Linux have been End-of-Lifed. New installations of Parallels Plesk Panel, since version 8.1, will not have the FrontPage Server Extensions feature. However, if you upgraded from the previous Parallels Plesk Panel version that had FrontPage Server Extensions installed, it will work as before.
For more information see the Parallels website.