I have the same problem as azmaverick. I have an 8320 but I don't have a BES and I have no option to add another email address... so I currently have no email at all on my BB.
This is my first BB and I just can;t work this out. I'm also in China mobile in Beijing, so local support is minimal/nonexistent.
I had the same problem when I first started using an unlocked storm. This has to do with the service book of your network provider. Just follow the instructions posted elsewhere regarding loading service book for different provider, then the BIS option will show up.
Have fun with your storm!
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