Conspiracy theorists unite: Nokia's replaced another prominent executive with a former Microsoft employee. In this case, it's the head of Nokia's entire US division that's being oustered, as 15-year Microsoft sales and marketing veteran Chris Weber replaces Nokia Inc. president Mark Louison effective immediately. Mark will "pursue new career opportunities" while Weber takes the reins, taking the somewhat unenviable role of rejuvenating Nokia's smartphone brand in the United States. Still, we imagine he'll have plenty of help, as he'll be working