With the free 20GB of iCloud storage that former MobileMe users enjoyed coming to an end, Microsoft is trying to take advantage of the situation by offering users who are losing this free storage an extra 15GB of SkyDrive space for free for one year. This would be on top of the 7GB that users get for free with their SkyDrive account, for a total of 22GB of space free for a year.
When Apple announced their free iCloud service at WWDC 2011, users of the previous, paid, MobileMe service were given a temporary boost in storage. The extra storage was previously set to expire in June of 2012. According to a recent change in Apple's MobileMe to iCloud transition FAQ, however, that's now been extended until September.