Microsoft is dramatically improving Bluetooth audio in Windows 10 With the release of Windows 10 Build 21370 yesterday, Microsoft gave us a glimpse of the direction in which it is taking the operating system in the coming months. As ever, the Insider build includes a number of enhancements, and chief among the improvements this time are changes to Bluetooth audio. Perhaps the most exciting change is the arrival of support for Bluetooth AAC, delivering higher quality wireless audio streaming. There's also an important fix for an issue that has plagued people using wireless phones. See also: Microsoft explains the implications of the introduction of a unified audio endpoint