when relevant content is
added and updated.
Windows 10 shipped with PowerShell 5.0 installed. The latest preview builds, and presumably, next months anniversary update have had PowerShell 5.1. Windows 2016 TP5 also ships with PowerShell 5.1
A PowerShell 5.1 preview is now available for Windows 7, 8.1, 2008 R2, 2012 and 2012 R2