Felt bad for the engineers that it had to happen on a Friday but for a multi day outage I guess it's a blessing in disguise.
Barring corona & year end holidays, this is probably the closest we can get to a global work holiday.
it happened on Thursday afternoon US time and it is still going on since then, Europe just joined this morning (unless someone worked yesterday late evening)
Even consumer Outlook is down.
This means you cannot do anything that requires email auth (OTP, signup etc)