Loosing passwords to Office 2003 is a tricky one, i havent found a way to do it yet, i have done the same thing may a time...
There are companies out there that charge that claim they can do it, most of them only charge if they do unlock the file....
I am guessing there are ways in *nix to assist in the unlocking/decryption of the file???
Not too sure really, i had a great little tool for Office 2000 that works a treat, but M$ are a little smarter these days.