20 years ago (2003-2006), Welchia, Blaster, Code Red... Windows boxes that weren't patched were infected within about 35 ± 5 seconds when connected to lightly-filtered Internet when it was still a capitalized proper noun. Ask me how I know and used JScript and psexec to mass remote into LAN machines to try to stop some of the madness and downtime.

Oh boy, tell me about it. The first real job I ever had, the first thing I did as a "network engineer" was say "Wow, I've never seen Windows XP machines on the public Internet before. Uh, is it just me or are these all really slow? Like a lot slower than they should be? And what's all this in Task Manager?" 2004 was a different time.