Word: Recover lost documentsOctober 1, 2009
Microsoft Help and Support (a.k.a. the Microsoft Knowledge Base [KB]) documents six methods to try if you happen to lose a Word 2007 and Word 2003 document through a Word crash, power outage etc.
Try the steps in the order listed — hopefully one of them will bring your document back from the dead. Oh, and print out the steps before you start as some of them require you to reboot your computer.
The KB article is here: http://support.microsoft.com/kb/827099
[Link last checked July 2009]