Microsoft is expected to announce Tuesday in Seoul, South Korea, that it will develop a version of its Microsoft Auto software for the Hyundai Kia Automotive Group, the world’s fifth-largest automaker.

Microsoft already has a deal with the Ford Motor Company for its Sync system, which uses voice activation technology to operate cellphones and play digital music.

With both Ford and Hyundai as customers, Microsoft’s software could potentially be put into more than eight million vehicles worldwide each year. Its competitors include OnStar from General Motors, Johnson Controls and QNX Software Systems from Harman International.