Allegations that Chinese authorities hacked into Microsoft Corp’s (MSFT.O) Outlook email service are “groundless slander”, the official Xinhua news agency quoted Beijing’s cyberspace regulator as saying late on Thursday. The comments, made by the Cyberspace Administration of China (CAC) spokesman Jiang Jun, were in response to a Monday report by an online censorship watchdog which said that Chinese users of the email service were subject to a hacking attack over the weekend.