Addition/ChangeDescription Change TrackingOpen Word files that contain revision marks in Word Web App. CommentsCan view, add, and reply to comments in Word Web App and PowerPoint Web App Co-authoringCo-authoring support is new in Word Web App and PowerPoint Web App. It continues to be supported in Excel Web App and OneNote Web App. EmbeddingCan embed Web Apps in websites in Word, Excel, and PowerPoint Web App Ink SupportUsers can view Word Web App and OneNote Web App files that contain ink. InstallationNot installed on the same servers that run SharePoint 2013. Must deploy one or more physical or virtual servers that run Office Web Apps Server. Then you configure the SharePoint 2013 farm to use the Office Web Apps Server farm LicensingIf no Office Web Apps editing licenses are applied for users, only viewing is supported. If you enable SharePoint licensing and then enable Office Web Apps editing, users who have appropriate license can edit Office files in a browser. Quick PreviewDisplays a preview of content when user rests over a search result in SharePoint. Share by LinkAllows users to send a link to a document to another user and allows the recipient to use Office Web Apps to view the document.