It's not full office though, it's home and student edition only.
So guessing you need the "commercial use license" however you cover it, e.g. EES/Single licenses etc etcQuote:
Final Office Home & Student 2013 RT version will be installed via Windows Update when available (free download; ISP fees apply). Some features and programs unsupported. See http://office.com/officeRT; commercial use license sold separately
http://www.microsoft.com/Surface/en-GB/business/home
Steve

