Build list legend
|Version of Microsoft Windows|
|OS family||Windows NT|
Windows Phone 8 (codenamed 'Apollo') is a version of the Windows Phone mobile operating system. This version was the first version based off of the Windows NT kernel instead of Windows CE, being developed as a version of Windows 8 in concurrency with it.
Windows Phone has its own versioning system. The build of Windows NT that a given build is based on is stated in the build's page.