It is getting painfully obvious that multimodal mobile devices used for both business and consumer applicationswill challenge both wireless carriers and enterprise organizations in terms of open interoperability for both person-to-person contacts and person-to-business applications. I don’t think “walled gardens” of the past will survive this shift in business communications and it will be end user choice for the “dual persona” mobile device they will carry, not the enterprise. (But the enterprise will still have to support such devices for their mobile business applications and internal communications!)