What are the Office Web Apps?
The Office Web Apps allow you to work with your Microsoft Office files from more places and on more devices by providing browser-based viewing and lightweight editing of Word 2010, Excel 2010, PowerPoint 2010 and OneNote 2010 files. Access your work at any time from a Smartphone or computer with an Internet connection.2 The Office Web Apps are designed to work with Internet Explorer, Safari and Firefox and requires SharePoint 2010 or a Windows Live account. Note: Office Web Apps will be available through Windows Live at a later date during Technical Preview and will have limited functionality at this milestone.