Office Web Apps are web based versions of Microsoft Office 2010. As they are hosted in the “cloud”, i.e. the programs haven’t been installed on your computer, the functionality that Office Web Apps provide is limited. However, they do offer a look and feel that is consistent with their desktop counterparts.

The Excel Web App is the free web based version of Microsoft Excel 2010 that anyone can use. Being a hosted web application, the Excel Web App does not require the installation of software on your computer. All you need is a Windows Live account.