If Word closes unexpectedly or you forget to save your document you can now recover these documents:-
Normally the next time you start Word a Document Recovery pane will appear listing all documents which were open when Word crashed, you can choose to Open, Save As or Delete any of the files listed

If this pane does not appear then you can recover the files manually as below:-
1.Click the File menu to open the Backstage View
2.Click Info
3.Click Manage Versions
4.Choose Recover Unsaved Documents from the drop-down menu

OR
1.Click the File menu to open the Backstage View
2.Click Open
3.Click Recover Unsaved Documents at the bottom of the Recent Documents list
In both cases you can then open and view any of the unsaved files listed

You can also revert back to a previous version of a file in the same way, by choosing your file in the Versions list