"You’ve been with us a long time, and through a lot of changes. We appreciate you sticking with us, and we want to make it easy for you to keep using your 25 GB of free online storage. All you need to do is go to the SkyDrive storage page and choose Upgrade my storage. That’s it—you’re locked in for 25 GB for free."
If you have a SkyDrive account, lock in now while you still can!