Last week, or seven days ago, Vsevolod Kokorin, also known online as Slonser, wrote on X (formerly Twitter) that he found the email-spoofing (also known as forgery) bug (or vulnerability) and reported or disclosed it to Microsoft, formerly known as Micro-Soft.
I used to have an IBM 8580 system which originally used a 386DX processor (the top spec model was clocked at 25MHz). IBM had a licensed clone of the 486 called Blue Lightning, and produced a CPU upgrade. It was a small daughterboard fitting into the 386 socket. The Blue Lightning was clock-tripled (like the Intel 486DX4, which came a couple of years later) so ran internally at 75MHz. That means I could now run Windows XP on that machine from 1987, if my parents hadn't sadly junked it. (It ran NT 3.51 very well so I'd hope enough of the old device drivers are still there in XP.) I expect the Blue Lightning upgrade would work in any 386DX system.
It's possible to go further back. Cyrix produced a 486SLC which had a 16-bit external data bus (like the 386SX) and could be fitted as an upgrade to 386SX systems, but also to 286 ones. There were upgrade kits for the IBM PC-AT. So you could in principle get Windows XP running on a machine from 1984.
There are two ways to write error-free programs; only the third one works.