Opening Files in Office 2010
Part of the Office 2010 Web Apps For Dummies Cheat Sheet
Each Office Web App has a command for opening the file you're working on in an Office 2010 program. In Excel Web App, for example, you can click the Open In Excel button to open the Excel worksheet you're working in Excel Web App in Excel 2010. You can click the Open In button when you need a feature that Office 2010 software has but that an Office Web App doesn't have.
Being able to call on an Office 2010 program when an Office Web App falls short is very nice indeed. But to do it, Office 2010 — not Office 2007, Office 2003, or an earlier version of Office — must be installed on your computer.
Realistically, you need Office 2010 if you intend to use the Office Web Apps. You need to be able to click the Open In button to take advantage of features in Office 2010 software. The Office Web Apps are designed to be companion programs to Office 2010. Not that you can't use the Office Web Apps on their own without installing Office 2010 on your computer, you will soon be frustrated by the Office Web Apps unless your computing needs are modest.