Actually, this is a brilliant move by Microsoft. As a developer, I can tell you that user interface mimicry is a time-honored tradition in software. Remember how Facebook copied Snapchat's stories? And plus, Google's monopoly needs to be challenged, and if users can't tell the difference in quality between Bing and Google anyway, then what's the problem? The real problem is that people are too used to Google. This might help break that habit.