There are two SkyDrive providers, one is our own SkyDrive provider that we have had before SkyDRive ever had an API and the other is the SkyDrive API provider which is the official SkyDrive Provider that uses the API.

You can find more about each on our Wiki:

Our own SkyDrive API provider supports Groups, and Mesh Sync'd storage, but it may not work for everyone as Microsoft introduced a random captcha which can break the initial mapping or cause it to stop working at some point. In this event you should use the official SkyDrive API provider.

Also note that if you are using two-factor authentication you must use the SkyDrive API provider.