"The task bar, the Start menu, the system tray, "My Computer", "Network Neighbourhood", all that: all original, patented Microsoft designs. There was nothing like it before. "

Apart from, you know, NextStep which had a dock for system tray/start menu as well as my computer and network neighbourhood.

You can find screenshots of NextStep 3.3 showing this such as https://winworldpc.com/product/nextstep/3x from 1992 and it's possible they're also in earlier versions - NextStep 1.0 was released in 1989.