You can create new documents or edit existing documents from anywhere that you have a connection to the Web by using the Office Web Apps
and Windows Live SkyDrive, the free online storage service from Windows Live.
You can use Office Web Apps
in any browser, but currently they are designed to work best in Microsoft Internet Explorer
7 or later, Mozilla Firefox
3.5 or later, and Safari
4 or later.
Do any of the following:
Create a new document in SkyDrive
Edit an existing document in SkyDrive
Share documents in SkyDrive
Can't open a document on SkyDrive?