The email module is currently buggy and hangs up OpenGoo on some settings. Besides that, it is not too usable and it lacks support for some protocols. That's why we decided hiding OpenGoo's email module by default, as we think it is not ready for prime time. This will be only for version 1.1 as we expect (though we can't be 100% sure) that it will be working fine for version 1.2.
What do you think about this? Should the email module be hidden by default? Please try to think about OpenGoo as a product, and not about your particular situation. E.g. if you are using the E-Mail module you wouldn't want it to be hidden, so you may be tempted to vote for "No", but if you agree that the email module is not finished maybe you should consider voting for "Hide only for new installations". If you think that the email module is fine as it is you would want to vote for "No".
Thanks for your feedback.