Save documents, spreadsheets, and presentations online, in OneDrive/Skydrive...free using the new Office Online.
https://www.office.com/start/default.aspx
(Just had a look and there are all there in my outlook.com which I use as an alternative email )
Office online has definitely been getting better as time goes by. I still think Google Docs is a little faster to load but this one is obviously more compatible with the full MS office suite.
just gave Excel Online a run around the block.
seems fine, it handles all the functions in my spreadsheet where OpenOffice(and those free alternatives) couldn't, so that's a start.
was pretty slow though, but that could well be partially (or wholly) due to my bandwidth.