Microsoft SkyDrive is a free tool that sync and store your files online. It securely store your files and get to them from any of your devices, including your PC, phone, Mac, or iPad. You never have to worry about forgetting a file at home or work, because the latest versions are always automatically there for you.
The new system offers 7GB of online storage space, a big drop from the previous 25GB. However, you can now synchronize the full 7GB; the desktop app allows you to work with files up to 2GB in size (the web version and other apps restrict file sizes to 300MB) and the whole syncing system is now much easier to use.
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Essentially the program takes a Dropbox-type approach, adding a custom SkyDrive folder to your PC or device. If you copy files to the folder, they’ll be synchronized. Rename a file on your phone and the change will appear on your PC, too. Delete a file on the SkyDrive.com web interface and it’ll similarly disappear from the folder, immediately.