The antiquated Frontpage2000 is only antiquated in the eyes of the code head nerds. There are millions of sites built with FP2K and they still work and work in all the browsers. I manage over a dozen FP2K sites and have no intentions of moving them into Expression Web or Dreamweaver.
The last time I checked Ebay FP2K & 03 were still fast selling items.
To help make the MM work a little better in SEO use Goggle Webmaster Tools and their validate site code.
A hosting company told me recently the majority of their customers still use Frontpage so they're working to keep their FP users happy.
I can code so no pun intended to the code heads that live and breath for validation.