Whether it’s a power outage or user error, we’ve all closed out of a document without saving it only to find out later we need it back. In Office 2010 you can!
If the document was never saved, go to the File tab, click Recent and then at the bottom right of the window click Recover Unsaved Documents. In the dialog box that pops ups, select the document you want to restore by looking at the date modified. This will open a draft, which should be saved immediately.
If the document was saved at one point but only some changes were lost, go to File and then Recent and look for the When I closed without saving tag below your file names.
PLEASE NOTE: AutoRecover is set to every 10 minutes but can be changed by going to File, Options and then Save.