Shaws comments somewhat are deceiving. Although surface does come pre-installed with a Office 2013, Microsoft's website says:
... meaning that if you are using for non-consumer use (ie for business) you have to pay the FULL price of Office 2013.
.
As sold, Office 2013 RT is not designed for commercial, nonprofit, or revenue-generating activities. However, organizations who purchase commercial use rights or have a commercial license to Office 2013 suites that include Outlook can use Office 2013 RT for commercial, nonprofit, or revenue-generating activities.
... meaning that if you are using for non-consumer use (ie for business) you have to pay the FULL price of Office 2013.
.