Mountain Lion Messages won't connect / go online

For the last few days Mountain Lion Messages won't connect / go online. Prior to that it would disconnec at random and it would be difficult to make it connect again. But now it's totally refusing to go online.

I solved the problem, with the help of a friend!
Turns out, even though Messages in Mountain Lion won't prompt you about this in any way, there is a difference between your @mac.com email and your @me.com email.
Messages on Mountain Lion has an iChat built in, but is actually at the same time a new protocol which does not use AIM like iChat. So, it's both AIM iChat and something new.
As soon as I added a new account inside Messages on Mountain Lion with @me.com I could reconnect and all is fine.
Apple, this is a lot less obvious to the end user than you might think. You have switched online services a few time and it always gets better and better. But Messages in Mountain Lion should prompt the user to add the @me.com address if this is required to use the software!

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