Microsoft employees have hit back at the firm's plan to bid for a controversial $10bn Pentagon contract. In a letter published on blogging site Medium, the employees wrote that they joined Microsoft with'the expectation that the technologies we build will not cause harm or human suffering.' They also accused Microsoft executives of betraying the company's artificial intelligence principles--ones that state A.I. should be'fair, reliable and safe, private and secure, inclusive, transparent, and accountable'--in pursuit of'short-term profits.' In a letter published on blogging site Medium, the employees wrote that they joined Microsoft with'the expectation that the technologies we build will not cause harm or human suffering.' It comes after Google dropped out of the bidding for a huge Pentagon cloud computing contract that could be worth up to $10 billion, saying the deal would be'inconsistent with its principles'.