Responding to privacy concerns, Redmond-based Microsoft recently announced that it would no longer identify specific mobile devices that make use of its location-tracking services.

In a letter written to members of Congress, the software colossal promised that it would stop using and storing unique device identifiers from Windows Phone 7 OS-based handsets.

Announcing the move, Microsoft mobile communications business president Andy Lees, “Without a unique identifier, or some other significant change to our operating system or practices, we cannot track an individual device.”

Microsoft also announced it would provide a preview of the next major update for Windows Phone, codenamed Mango, on May 24. The Mango update, which is also known as Windows Phone 7.5, will likely bring better multitasking and application-switching features along with support for Kinect-like motion sensing via a phone’s camera.

Director Brandon Watson, of developer experience for Windows Phone, also said that the imminent update would include Bing Audio, which allows smartphone users to identify songs playing in the vicinity, and Bing Vision that allows a device to scan barcodes, QR Codes etc.

The release of Mango tools would allow developers to build applications for Windows Phone 7.5-based devices.