SkyDrive? You can forget about that, it's now being called OneDrive.
SkyDrive was Microsoft's own cloud storage system that worked with Windows and Windows Phone to help users store data and media in the cloud. But the name was already owned by BSkyB the British broadcasting company.
BSkyB sued Microsoft for the name infringement, Microsoft didn't put up a fight so they agreed to change the name. Everything will remain the same, you'll just be seeing Sky replaced with One.