How do I revert back to a previously saved version of a file?

[Alex W.]

I erased a file to reuse the format of it and accidentally pressed save
instead of save as. In other versions there is a simple command to revert
back to the last saved version, but I can't seem to figure it out on Word 07.
Please help.

 

[JoAnn Paules]

If you've closed that file and don't have a back up of it, it's gone.