Skype audio graded by workers in China with 'no security measures'

Exclusive: former Microsoft contractor says he was emailed login after minimal vetting

A Microsoft programme to transcribe and vet audio from Skype and Cortana, its voice assistant, ran for years with "no security measures", according to a former contractor who says he reviewed thousands of potentially sensitive recordings on his personal laptop from his home in Beijing over the two years he worked for the company.

The recordings, both deliberate and accidentally invoked activations of the voice assistant, as well as some Skype phone calls, were simply accessed by Microsoft workers through a web app running in Google's Chrome browser, on their personal laptops, over the Chinese internet, according to the contractor.