Yesterday, many Mac system administrators learned on Twitter of an urgent change arriving to their servers leaving less than 24 hours until the expiration day for Apple’s certificate used to sign updates. This change affects a tool that gets little fanfare and is deeply buried as one of 20+ items that Profile Manager can do. Although a Software Update Server (SUS) can normally set up once and mostly forgotten, but doing so can save money, conserve bandwidth, reduce support tickets, and make a company’s Macs more stable. …