Office 2013, especially the preview version of Office Home & Student 2013 RT that comes with the Microsoft Surface tablet, changes the model for writing add-on programs. There are now Office apps and an Office app section in the Windows Store. Many of these apps are free, but it's easy to see enterprise-oriented apps being developed and charged for. Microsoft's implementation of the apps in Office 2013 is clumsy in some ways, but promising.
You can find Office 2013 apps on the Web in Office Store and Apps. Apps are available for SharePoint and Office 2013 Word, Excel, PowerPoint, Outlook and Project. The Surface tablet's Home & Student version of Office does not include Outlook or Project. However, Surface with Windows RT tablet users can still make use of apps built for the Web-based Outlook 365. At this point, almost all the apps are free. So, it is easy to sample a wide selection of the apps. However, given the broad demand for Office in the corporate world, it's easy to imagine that paid apps will emerge at some point. You can see a few of the featured apps in the screenshot here.
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