Office Web Apps are a brand new addition to Office 2010 that will make it even easier to work with your Word, Excel, PowerPoint and OneNote files. Office Web Apps give you a quick way to access these files and continue to work with them. They also give you the freedom to move around even without your laptop because as long as you have access to a PC or Mac with Internet access and a browser or even a mobile device and a micro browser, Office Web Apps provide browser-based viewing and lightweight editing of Word, Excel, PowerPoint and OneNote documents without requiring any additional software to be installed. You get high-fidelity viewing, great compatibility with your existing files and the familiar Office interface that supports the key authoring functionality in the browser on your PC and Mac. Leave your computer behind knowing that you'll still have access to your work, and all the Microsoft® Office Web Apps must be installed on a server running Microsoft SharePoint Server 2010.