Microsoft confirmed the outage was not an attack but caused by
portion of infrastructure had "elevated load" - a large number of servers became unexpectedly unavailable.
Process that establishes secure connections got overwhelmed and stopped processing requests
The good thing is that Microsoft has accepted to pay so claims to affected people of which my company was one, we were unable to send no receive emails since money. Right now, the email function is back but very dull probably because the system is still being worked on.