Microsoft Home and Student 2013 RT Preview edition installed. Final Office Home & Student version will be installed via Windows Update when available (free download; ISP fees apply). Some features and programs unsupported. Office Home & Student 2013 RT Preview and the final version are not for use in commercial, nonprofit, or revenue generating activities. Commercial license options available (sold separately). See http://office.com/officeRT.
So, it looks like all those business users won't be able to actually use the installed Office suite for any business activity. The restrictions are pretty strong -- I expect that looking at a work email attachment on a Surface would violate the "no commercial" aspect of this. Obviously, MS does want the surface to become a back-door replacement for enterprise PCs with their expensive bulk-purchased commercial Office suites, but this seems like a very strong limitation for a mobile device.