Microsoft Front Page Extensions have been removed from all domains.
Why did Microsoft do this? There appear to be two reasons. First, Microsoft announced "end-of-life" for Front Page, and for Front Page Extensions, in 2006. They have replaced front page with a new product called Expression Web. Expression Web uses Internet standards, so it does not require the special Front Page Extensions anymore. This also gives you an opportunity to spend $200 or more to buy new software from Microsoft.
Second, the architecture of Front Page Extensions created security problems. There was no way to have a fully secure web server and also support Front Page the way it wanted to be supported. Removing the extensions improves web server security.
Microsoft changed Front Page into a product called Expression Web. And has since abandoned that to the public. It's available as a free community support product from their website. But the bottom line is none of their products require the server extensions that Front Page did. So in order to move forward the extensions have been removed.