This Easter Egg will work in FrontPage and FrontPage Express. Just follow these steps:
1. Start the FrontPage Explorer 2. Hold down the 'Shift' key 3. Click 'Help->About' 4. Click OK 5. Keep the Shift held down then click 'Help->About' for a second time 6. Click OK 7. Keep the Shift held down then click 'Help->About' for a third time
Now you should see the credits and hear a song playing.