1. Use your backup.
2. Did you mail it to someone so is there a copy in your sent items.
3. Get cracking and do the work again and next time remember the backup.
4. Sorry for Being the bearer of bad news.
Maybe you saved it to a different location.
1. Choose File, and see if the file is listed on the Recently Used file list
at the bottom.
2. Use Windows search to search for the file anywhere on your hard drive or
server.
3. However, if it is on the server, then IT will have a backup which is what
Mike was refering to.
If Excel didn't crash during the save operation, its very likely the file is
somewhere.