By now, you are familiar with Windows Store apps. There are some pretty cool ones available in the store, and publishers are adding more every week. A great thing about Windows Store apps is they are super simple to install and uninstall. But what about line of business LOB apps? You probably do not want to publish them through the Windows Store since that would make them publically available.Instead, you can sideload LOB apps. Sideloading simply means installing a Windows Store app without publishing it in and downloading it from the store. You install it directly.

via Sideload Windows Store Apps – Windows 8, Try, Test, Help | TechNet.