[Zope] why use eGroups for the list archives?

Just out of curiosity, why are we (the Royal we) using eGroups to archive the Zope mailing list? There is so much knowledge to be mined from the thousands of messages entombed there and yet the search facility on eGroups is woeful. Unless of course they're using Zope and triggering on my IP address to dynamically serve me the dumbed-down interface while the rest of you get the power-user version ... Darran (who may or may not own stock in DejaNews).