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The four Office Web Apps work in non-Microsoft browsers, with support for in-browser editing in Chrome (shown here) and Firefox.
Not all editing features are available in the web apps, but you can make changes without affecting those missing formatting options.
You can also share documents directly from the editing screen, using the File menu shown here.
The ability to create, share, and fill OneNote notebooks in SkyDrive is unique among these three apps. These notebooks are useful for sharing information about projects and about vacation plans, as shown here.
There's no doubt that this is a Google service. If the interface shown here looks familiar, that's because it used to be called Google Docs. Although you can store other types of files here using the Windows Explorer interface, I was unsuccessful in uploading anything other than