Hi Blipdoolpoolp,
I attempted to re-create the issue you are having in our Enhanced Webmail and was unable to do so. Currently I am using Internet Explorer 8. Where are you specifically having the issue with the backspace key not working? Is it when you're composing an e-mail and trying to make a correction? Does it happen in the "To:" field of the person you are trying to send a message to? I'd like to help, if you have a specific scenario I can try it to see if it happens on my end as well.