Exchange "Address Book" from account aliases

The hosted exchange server appears to supply an address list that contains all user emails and forwards for the Comcast account and associates them with the primary account holder.  At least that's what I think is happening in this screenshot (taken from the address book window of the webmail client):

The problem this causes is when an Outlook client tries to resolve one of those addresses it comes up with the primary account holder name as the source instead of the actual contact.  How can I get rid of this bogus address list?

This is probably really a question for Comcast Email/Internet technical support level 2, but there is no way to contact them via email and it's pretty hard to paste a screenshot into a telephone.  Sigh.