I would suggest buying it yourself. If price is an issue - Libre Open Office offers an alternative to Microsoft Office....
There is a chance that you won't be caught, but according to the license agreement, you would be in violation of the agreement, and you could get in some serious trouble.... Theoretically - Microsoft could charge you twice the actual retail price of the Microsoft Office product (i.e. Microsoft Office Professional can retail for $400 - and you could be forced to pay $800 for your installation).