skydriveFormer users of Apple’s MobileMe service have started receiving messages reminding them that the complimentary 20GB of storage that they received when Apple shifted to iCloud two years ago will expire on Sept. 30. That means users with more than 5GB of data, the limit for free iCloud storage, will need to reduce the amount they’re storing or upgrade to a paid plan.

Microsoft has another idea for them. The company’s SkyDrive team announced on Twitter today that it will offer an additional 15GB of free storage for a year, beyond its existing 7GB free plan, to any former MobileMe users who forward their messages from Apple to a special Microsoft email address.

Judging from the retweets and favorites, the offer is generating plenty of buzz on Twitter. This builds on Microsoft’s effort to position itself as the low-cost cloud storage provider, with lower premium rates and a higher storage limit for its free plan.

However, given that many former MobileMe users are likely to be Apple loyalists, it would be interesting to see how people actually take Microsoft up on this offer. And considering the time limit, these users likely to be facing the same dilemma in another year — deciding whether to reduce their cloud footprint or upgrade to a paid SkyDrive plan, or whatever it’s called at that point.

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