Back/Forward navigation in Word 2003/2007
Solution 1:
Right click on the toolbar, and add the Web toolbar. Then, just use the forward and Back buttons.
Solution 2:
In Word 2007, you can use ALT + the left and right arrows.
Solution 3:
With Microsoft Word 2007:
Click the Office Orb -> Word Options
Then go to Customize, and under Choose commands from:, select All Commands. Then, just add the Back and Forward buttons, and they will appear at the top, near the Save & Undo buttons.