People around the world are struggling to access emails, messages and file storage, as tech giant Microsoft investigates an outage.
The company says they are testing an alternative system which has allowed "a subset of affected servers to successfully return to service". It is not applying the change more broadly.
In the early hours of this morning, Microsoft first acknowledged it was investigating issues relating to Teams functionality for users in North America.
The next update from the company expanded the issue to "users in any region", noting reports of difficulties accessing email inboxes through their Outlook and Microsoft Exchange products.
Microsoft Outlook, Exchange Online, Teams, OneDrive, Copilot, SharePoint Online, Defender XDR, Planner, To Do and Purview have all been impacted, according to Microsoft's Service Health Status site.
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The company says its infrastructure has been strained by "a number of servers being unexpectedly unavailable".
"We're testing a configuration change to address a problem that's causing servers to fail automated health checks and become unavailable," it said in an X post.
"We've initiated a restart of all affected servers and are monitoring health as they return to service."
The company initially said it had not identified any change "correlated with the start of impact" but later updated that a review had "identified a small number of configuration updates" which may have contributed.
Microsoft is sending updates through their status page and X account, the next is expected later this morning.
