Are you talking about the Server Administrator Password? or the Call Pilot Manager admin password?
If the server password is missing, try the default if on 2.02, after that Config Wizard prompts you to change it.
If you have a good backup, just use the disk image CD and rebuild the server. It doesn't take that long and then just restore your backup. I have done that for customers and it works fine.
I don't know of a way to break the server admin password without getting 3rd party software. I know it's out there. You can google it, but they all seem pretty expensive.