Did you ever find yourself closing Word after making some changes, and then accidently clicked ‘No’ when asked if you want to save your changes? Then you suddenly realized what you have done, only to find that there was no way to recover your work? You are not alone.
But here’s the deal: If you’re using Office 2010 or later version of Office, there’s a great – and easy – way to recover your unsaved work.
Recover Your Work in Office 2010
In order to recover your work in Office 2010, Open the relevant program (Word, Excel, Power Point etc.), and create a new file or open some other file. It doesn’t matter which file.
Click on File -> Info -> Next to Versions area, There is a button called “Manage Versions”. Click on this button and there you’ll find an option called “Recover Unsaved Documents”:

To get some more details and help, check out Microsoft Office 2010 engineering team’s blog.
Good luck!