Frontpage is a mess, and if you ask me it should be forbidden.
I hate it, and I don't feel like writing a howto for these damn special MS solutions that the world hasn't been waiting for...
However, it's in ISPConfig because there are people who insist on using it. They can do so if they know how to install Frontpage on Linux, but we cannot support them because this setup is a mess even for Till and me...
I hope you understand my point... I think MS did this Frontpage-for-Linux thing not really whole-heartedly...