 This is a Bloomberg Money Minute. Microsoft tightening up its cybersecurity measures in China, telling its employees there that starting in September, they'll only be able to use Apple iPhones at work and can no longer use any phones powered by Google's Android system because of security worries. Meantime, Apple getting ready to celebrate the 10th anniversary of the Apple Watch with a big upgrade to its next generation watch, a bigger display, and they'll be thinner. Shares of Apple pretty much flat while elsewhere