"Our processing of personal data for these purposes includes both automated and manual (human) methods of processing," the updated policy reads. Before the change, it wasn't clear from the policy or Skype Translator FAQ that people were listening in -- Skype only records voice conversations when translation features are enabled.
The company states on several pages that it uses voice data and recordings to improve speech recognition, translation, intent understanding and more across Microsoft products and services. "This may include transcription of audio recordings by Microsoft employees and vendors, subject to procedures designed to prioritize users' privacy, including taking steps to de-identify data, requiring non-disclosure agreements with vendors and their employees, and requiring that vendors meet the high privacy standards set out in European law and elsewhere," according to identical language on the Skype Translator FAQ, Cortana's support section and a Microsoft privacy page.
While Microsoft allows users to delete audio recordings it makes of them through the privacy dashboard, it could have been more transparent from the outset as to what it was doing with that data. Apple plans to let Siri users opt out of the recordings soon, but it's unclear whether Microsoft will follow suit.