SkyDrive is now OneDrive, and SkyDrive Pro is now OneDrive for Business. Read more about this change at From SkyDrive to OneDrive
With Office Online you can create and edit Word, Excel, PowerPoint, and OneNote files in your web browser. The files are stored online, so you can share them by sending a link that opens the file in the browser. To get started, sign in at OneDrive.com.