Microsoft's range of cloud-based services went down on Tuesday morning, following a botched update.
More than 30,000 people reported issues on status-tracking website DownDetector, saying there were problems using Microsoft products like Teams, Xbox Live, Office 365, Azure and Yammer. Most said they had server connection problems, with log-in problems also causing frustration.
At about 8:40am (NZ time) the computing giant confirmed it was aware of the problem, and that it could be affecting users worldwide.
Just after 9am it said the cause was "an issue with a recent change to an authentication system".
"We're rolling back the update to mitigate impact, which we expect will take approximately 15 minutes," the company tweeted at 9:11am.
While some users complained on Twitter they still couldn't access Microsoft's services after the 15 minutes was up, Newshub was able to access Office 365 without issue.
One Teams user Newshub spoke to who works in an office in downtown Auckland said it wasn't working as of 9:45am.
In a post on its own website, Microsoft said it would provide the next update at 10am (NZ time); but followed that up with a tweet saying the rollback was "taking longer than expected", with no estimated time a fix would be in place.