Through Surface RT has Office 2013 Preview pre-installed, still if we compare Microsoft's promotional videos made for Surface, it's clear that Microsoft is promoting Surface RT as a fun device, made for playing games, watching videos etc. Where as Surface Pro, as the name suggests, is for the professionals.
Surface with Windows RT video
Surface with Windows 8 Pro video
Via Neowin
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Surface RT is for fun & Surface Pro is for work
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