no wonder, as MacOSX/OSX/macOS is the direct successor of NEXTSTEP (the OS), when Steve Jobs came back he managed that Apple buy his company. From Interfacebuil

no wonder, as MacOSX/OSX/macOS is the direct successor of NEXTSTEP (the OS), when Steve Jobs came back he managed that Apple buy his company. From Interfacebuilder (nowadays XCode) to Mail, several things in early MacOS X 1.0 server looked similar to the previous NEXTSTEP version (decorated with a MacOS 8/9 theme). http://toastytech.com/guis/osxsv.html http://toastytech.com/guis/osxsv.html Compare yourself, see the "Apple MacOS "X section: http://toastytech.com/guis/indexapple.html http://toastytech.com/guis/indexapple.html