Microsoft Outlook, Teams, 365, and a variety of other services was down today; what do you think caused it?

My outlook email at work was intermittent during the min to later late afternoon hours in western Pennsylvania. Our online data collection program had a warning banner at the top of the main page. I gave up around 4 PM and left. I’m on call throughout the night and it’s been quiet. Whether it’s because of the outage is uncertain.

that’s just the people who had other means of communication to complain about it.