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.
Next, Microsoft provides a five-step list to actually install the app within Office 2013 RT. This is, in my opinion, an excessive number of steps and needs to be simplified to just one or two actions in the near future. The five steps are:
Go to the "Insert" tab (or "Project" tab for Project 2013)
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