MS WORD 2007 - Add the Close or “X” Back
Option 1:
1. With at least one document open, right-click the Office Button 
then Customize Quick Access Toolbar.
2. Click Advanced then scroll down to the Display section.
3. Clear the checkbox next to Show all windows in the Taskbar .
4. Click OK to finish and exit.
Option 2:
Use Ctrl-W and Ctrl-F4 will close the current document without closing Word itself.
