You can determine the version of office in two ways. The long way will show the precise version Microsoft Word which is installed plus details of the most recent updates or service pack.
The quick way is simply to look at the visual style of the interface. Below the images are instructions to find the version:
Or the long way is to click on File menu in top left corner, then choose Account
Or click on File menu in top left corner, then choose Help
Or click on the Microsoft button in the top left corner of Word 2007, chooseWord options and then Resources
Or click on Help menu towards the right, then choose About Microsoft Office Word