Sometimes you may find yourself on a device that doesn’t run a web browser that supports the Excel Web App. You can still review workbooks for later use. For example, when you use the Safari web browser on your iPhone 4 (unlike the Safari that runs on MacBook Air laptop and iPad tablet), the browser opens workbook files with the Excel Mobile Viewer instead of the Excel Web App.
The only problem with this is that the Mobile Viewer is just what it says it is — a viewer that only lets you see the data. If you find some things that need editing, you will have to make a note of them and get yourself to a device that runs a browser capable of running the Excel Web App or one on which a full-blown version is installed.
Don’t forget about Microsoft’s SkyDrive app for the Apple iPad and iPhone, if you use these devices. The free SkyDrive app is available for download from the App Store on either device. The SkyDrive app enables you to access all the Excel workbook files you store on your SkyDrive on your iPad or iPhone.
Just be aware that you can only review the worksheets that you open with this app because it is not yet capable, as of this writing, of running the Excel Web App. You can, however, use the app to send links to the workbook, change the permissions, rename the file, and even open in another app that can open Excel workbook files on these Apple mobile devices.
