The currently supported versions of macOS are 10.14 ('Mojave') and 10.15 ('Catalina'). The archive of this mailing list is available at. You can also reach the Service Desk by phone at 77777 or by e-mail at the Mac community at CERN has an active mailing list: where you can get expert opinions for some very specific questions. Report an incident or submit a request with the Service Desk.Check this website, including the How To documents listed below, which provide answers to many common questions.