I have the same problem. I have Verizon and have the Curve 8330. I wonder if Verizon is working on their system? I might give them a call today or stop into my verizon store and talk w/ them.
I've registered and tried to send my service books and it won't work. I deleted my accounts and now I can't add them back through my phone (due to the error) or even online now... it won't load. I think everyone is trying to get into the bis website.
I have the same problem for my pearl, and I'm with T-mobile. I will randomly get a bunch of emails if I restart my phone, but otherwise they don't show up. Also, the website for changing/creating email accounts won't work for me.