For those looking to get 100GB of extra Microsoft OneDrive (prevously named Skydrive) storage for 2 years, click the following link:

https://login.live.com/oauth20_authorize.srf?client_id=000000004C12B387&scope=wl.signin%20wl.basic%20wl.emails%20wl.skydrive%20wl.onedrive_provision_quota&response_type=code&redirect_uri=https://preview.onedrive.com/callback.aspx

Previously I though this was only working for the United States (or from somewhere else using a proxy), but this worked fine for me from within the Netherlands.

Enjoy your extra cloud storage.