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Not sure where to post this, but is the demo server having problems, I have been trying to access it all day and I get a message saying that the server is at its capacity please try again later.
I don't know if there's a problem with the demo server or it is just at capacity, I've just tried and got the same message as you. If you're still getting the problem later today then I'd drop an email to support about it (support@zimbra.com) and let them know what's happened.
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