Data Intercept Technology Unit (DITU)

See the following -

How Microsoft Handed The NSA Access To Encrypted Messages

Glenn Greenwald, Ewen MacAskill, Laura Poitras, et. al. | The Guardian | July 11, 2013

Microsoft has collaborated closely with US intelligence services to allow users' communications to be intercepted, including helping the National Security Agency to circumvent the company's own encryption, according to top-secret documents [...]. Read More »