His role was recently changed to "senior advisor to the CEO" at Microsoft.
Mundie was appointed chief strategy officer at Microsoft when Bill gates retired from the company in 2008. The 63-year-old Mundie handed his previous role to Eric Rudder, who now carries the title of Chief Technical Strategy Officer.
According to his corporate biography, Mundie joined Microsoft in 1992 "to create and run the Consumer Platforms Division, which developed non-PC platforms such as the Windows CE operating system; software for the Handheld PC, Pocket PC and Auto PC." The executive also oversaw Microsoft's WebTV division.
In his new role, Mundie "works on key strategic projects within the company, as well as with government and business leaders around the world on technology policy, regulation and standards."
Windows CE is actually used quite extensively
You may be thinking about Windows Mistake Edition (ME), or Windows XP Embedded which is also used quite extensively in POS systems and other embedded devices.