The add-in allows you to leverage PowerPoint to put together a step-by-step flow of your concept that is easy to understand and gives developers and other technical colleagues a reference point when reviewing PBIs. Having that visual helps quite a bit when you are trying to establish work items to go along with those PBIs, and gives all parties involved a better sense of security that requirements are being properly conveyed to the team whose responsibility it is to bring them to life. While not true of every organization, many companies do have Office 2007 or greater, which is half the battle. In order to install and use the TFS storyboarding add-in you must also have a copy of Visual Studio Premium, Ultimate or Test Professional (2012 and 2013 are supported currently).
You do not need to have TFS in order to use this add-in. It relies more on Visual Studio than it does TFS or Visual Studio Online. You can launch storyboarding from both of these platforms, though, which is convenient. You can also link a storyboard directly to a TFS work item. A great overview of how to use the add-in can be found on the Microsoft Developer Network’s site. One of the key features of this add-in is the ability to create, import and export custom storyboarding shapes. These can be anything from your company logo to screen mock-ups that are specific to internal applications you work with to icons and device types. There are some great community-backed shapes posted in the Visual Studio Gallery, including iPad/iPhone shapes, Windows 8 shapes and even a nifty branching and merging shape which could be used to storyboard existing or new branching/merging strategies for your code base. You can also find some re-sizable storyboard shapes in the Microsoft Visual Studio Team Foundation Server 2013 Power Tools extension.
Despite there being a slight learning curve on using the add-in and getting storyboarding started for your team, I guarantee that once you do, figuring out what the customer wants will no longer be a gamble and will more likely be a sure bet.