I was under the impression that RIM were the first to pioneer this idea of email on a mobile device?
So surely the argument would be that why should you replace something thats been the leader in the industry since the start. For example, why does everyone still buy a Ford?
"All of the things I enjoy are immoral, illegal, or fattening" - Oscar Wilde
"All of the things I enjoy have a Wife Approval Factor (WAF) of 0" - Me