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.
Selecting and installing an app must be done on the device itself, in my case my Surface tablet. This is unlike Google's Play Store for Android or Microsoft's own Web-based Windows Phone store which both allow you to shop for apps on the Web and send the app to a target device. This means that you start by launching Internet Explorer on the Surface tablet itself and pointing it at the Office Store and Apps site. Press the "Add" button after you find the app you want. However, note that there are a few more steps before you can actually use the Office app.
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