Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple MobileMe users to migrate their accounts to iCloud for developers
Apple has recently opened up a new portal at me.com/move for developers. The website now lets developer with the MobileMe service to migrate their account over to iCloudApple MobileMe users to migrate their accounts to iCloud for developers.
Apple allows you take your Mail, Contacts, and Calendar information over to iCloud.
Apple have also said that users should keep using iWeb, iDisk, and Photo Gallery up until June 30, 2012. Apple annouced that a couple of features will not be compatibale with iCloud: Dashboard widget sync, dock item sync, keychains, signatures, mail account rules, mail smart boxes, and mail preferences.
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