This document summarizes Office Web Apps, where they can be found, browser compatibility, versions, viewing and editing capabilities, co-authoring features, known issues, and requirements. Office Web Apps allow viewing and limited editing of Microsoft Office documents in a web browser. They are available in SharePoint 2010, Live.com, SkyDrive, and Office 365. Compatible browsers include IE 7+, Firefox, Safari, Chrome, and mobile browsers. Co-authoring is supported for Word, PowerPoint, and Excel. The full Office client is needed for more complex tasks. Silverlight is recommended for better performance with Word and PowerPoint.