[nojito]

Powershell is Open Source

https://github.com/PowerShell/PowerShell

[jdmg94]

that is a thing that started under Nadella's leadership, during the 90s it was a different story.

[feldrim]

Those two "PowerShell"s are not the same. For the sake of cross platform deployment, they moved away from the original a lot -though they managed to support many things in time. The old and original one was released in 2006,IIRC, so it didn't exist in 90s.