The most anticipated feature of Microsoft's (NASDAQ:MSFT) Windows 10, set for release on Wednesday, isn't some new application. It's the return of the traditional Start screen, which Microsoft ditched in August 2012, with Windows 8. For that reason, Windows 10 is a lot like Coca-Cola Classic. Let me explain. When the Coca-Cola (NYSE:KO) announced in April 1985 that New Coke would replace the original formula of its flagship soft drink, consumers protested. Some even hoarded cases of the original flavor beverage. New Coke is now seen as a cautionary tale about tampering with a well-established and successful brand. In October...