My son has the same issue. He already activated his account, validated it and everything, but when he signs in, he gets "server down" and tells him to contact account billing. This is for the demo.
edit: figured it out, you have to activate email account AND demo.... durrrr.
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http://www.startrekonline.com/user/free_demo_start/Cryptic
edit: figured it out, you have to activate email account AND demo.... durrrr.