Qualcomm will include support for the Windows Mobile platform on its new integrated Mobile Station Modem chipsets, enabling more users to get Windows on their devices.
Microsoft said the move would allow device makers to shorten the development time for Windows Mobile-powered phones.
Support via the upgraded chip would also give users extended battery life while running a wide variety of business and entertainment applications, said Microsoft.
Analyst Gartner estimates sales of Windows Mobile-based smartphones will reach 64.5 million by 2009.
Microsoft said there were currently 47 device makers shipping Windows Mobile-based devices, with 115 mobile operators in 55 countries supporting them on their networks.
Smartphones using MSM chips with Windows Mobile are expected next year.