Microsoft is investigating widespread connectivity issues affecting Microsoft 365 services, including Outlook.
The company initially reported Thursday that users in the Americas were experiencing problems accessing Exchange Online mailboxes through multiple connection methods.
Microsoft later said the disruption may be worldwide.
"While we're working to mitigate impact, we've confirmed the issue may affect Microsoft 365 service connectivity for users in any region," the company said in an update on social media.
Microsoft said its investigation found that a portion of its infrastructure was experiencing unusually high demand across multiple regions, likely contributing to the connectivity problems.
The company has not said how many users are affected or when service is expected to be fully restored.
