SkyDrive

SkyDrive is a Microsoft service for file sharing and cloud storage. Users need a Microsoft account and based on it thy can upload their files on SkyDrive and keep them public or share selected files with other people (for files shared for public, viewers doesn’t need a Microsoft account).
 
This service comes with free space up to 7 GB and offer additional space for money.
 
You can access files from local computer, from anywhere on the web or remotely, all you need is to login with your username and password.
 
Is synchronizing your files to storage servers and keep versions of them if you only modify it. Allows posts directly on Facebook and Twitter.