iOS devices and Macs with OS X 10.6.6 or higher experienced a nearly five-hour outage, from 11:45 a.m. to 4:32 p.m. PT (2:45 to 7:45 p.m. ET) yesterday.
Steve Jobs Nation was not happy.
The Cupertino, Calif. company’s instant message service and video-calling app's outages were confirmed by Apple, which said “users are unable to use” those functions.
The company’s status page now says, “Normal service is restored.” It’s unclear what caused it or whether any iPhone users contemplated suicide during this traumatic period.
Fortunately, Twitter was still up.
Source : http://www.thehollywoodgossip.com/2012/11/imessage-not-working-for-like-five-hours-apple-users-flip-the-f/