I have a hack a much longer, around 2, 3 years. I've used Lion, them a updated to 10.8.2 which always work 100%, and now I'm getting a problem: my iMessage does't work. It worked, but when I activated my account on my new iPhone (2 months ago), the iMessage just STOP... now I'm get that message (in image attached).
PS: iCloud and Facetime works.
If someone knows something about that, please, reply here. THANKS!