Microsoft confirmed for the first time that Windows Phone 7 is based on the Windows CE 7 Kernel

Microsoft has not officially published the kernel version of Windows Phone 7 since its launch. Some sites once thought that Windows Phone 7 was based on WinCE 6. Of course, Windows Mobile 6.x is based on the kernel of Windows CE 5, so for Windows Phone 7, what they think is the turn of Windows CE 6. But in wpmind.comArticle(Windows Phone 7 Development, which you must know) indicates that Windows Phone 7 is only applicable to Windows CE 7.

A Microsoft Windows CE employee confirmed this in his blog. Windows Phone 7 is based on Windows CE 7 (Windows Embedded compact 7) kernel.