Depends how you define a network outage. One of my transatlantic circuits has been a bit ropey - had a 2 second outage on it a couple of nights ago, does that count as a network outage?

If a user has a local network problem, that's not a loss in the service. If multiple users do that's an issue. My home broadband went out for 3 minutes at 23:33:43 GMT on May 13th, but then I wouldn't run a service needing 24/7 on my home broadband.

My frickin nasdrive has a better uptime than slack.