https://apnews.com/592c53b7ef26fe526f7e397138b86493 > Slack, the messaging service used by millions of people for work and school, suffered a global outage on Monday, the first day back for most people returning from the New Year's holiday. > It's the latest tech glitch to show how disruptive technical difficulties can be when millions of people are depending on just a few services to work and go to school from home during the pandemic.