Microsoft confirms problems.
Microsoft Teams, used by many companies around the world, are down for the count on Monday.
The problems arose when thousands, or hundreds of thousands, of workers, tried to log on at the same time. Several countries, including Norway, have, as is well known, recommended that people who have the opportunity to work from home.
This causes users to struggle
Today's Teams challenges include login issues and messaging issues.
"We are investigating issues related to messages in Microsoft Teams," Microsoft writes on Twitter.