Shortcut to Apply Last Command in Microsoft Word

You can undo, redo, or repeat many actions in Microsoft Word, PowerPoint, and Excel. You can undo changes, even after you have saved, and then save again, as long as you are within the undo limits (By default Office saves the last 100 undoable actions).

There is a shortcut key that repeats the last task in Word, Excel and PowerPoint, That is F4.