Mobile operating system family for smartphones and pocket PCs, developed by Microsoft. The first Windows Mobile OS was released in 2000, though it is based on Windows CE, which was released in 1996. It has a hybrid kernel, and installs updates through the proprietary adaptation kit upgrades (AKUs). It includes numerous applications developed with the Windows API and resembling standard desktop programs, including Outlook Mobile, Internet Explorer Mobile and Office Mobile. It was superseded by Windows Phone in 2010, and support for the most recent version, Windows 10 Mobile, ended in January 2020.